Three Fingered Jack
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Three Fingered Jack is a
summit A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. The topography, topographic terms acme, apex, peak (mountain peak), and zenith are synonymous. The term (mountain top) is generally used ...
of a
shield volcano A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more v ...
of the
Cascade Range The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, ...
in the
U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sover ...
of
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
. Formed during the
Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...
epoch In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided by ...
, the mountain consists mainly of
basaltic andesite Basaltic andesite is a volcanic rock that is intermediate in composition between basalt and andesite. It is composed predominantly of augite and plagioclase. Basaltic andesite can be found in volcanoes around the world, including in Central Ameri ...
lava Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or un ...
and was heavily
glaciated A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as ...
in the past. While other Oregon volcanoes that were heavily glaciated—such as
Mount Washington Mount Washington is the highest peak in the Northeastern United States at and the most topographically prominent mountain east of the Mississippi River. The mountain is notorious for its erratic weather. On the afternoon of April 12, 1934, ...
and
Mount Thielsen Mount Thielsen, or Big Cowhorn ( Klamath: hisc’akwaleeʔas), is an extinct shield volcano in the Oregon High Cascades, near Mount Bailey. Because eruptive activity ceased 250,000 years ago, glaciers have heavily eroded the volcano's st ...
—display eroded volcanic necks, Three Fingered Jack's present summit is a comparatively narrow ridge of loose
tephra Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism. Volcanologists also refer to airborne fragments as pyroclasts. Once clasts have fallen to the ground, they rem ...
supported by a
dike Dyke (UK) or dike (US) may refer to: General uses * Dyke (slang), a slang word meaning "lesbian" * Dike (geology), a subvertical sheet-like intrusion of magma or sediment * Dike (mythology), ''Dikē'', the Greek goddess of moral justice * Dikes ...
only thick on a generally north–south axis. Glaciation exposed radiating dikes and plugs that support this summit. The volcano has long been inactive and is highly eroded. Three Fingered Jack has diverse flora, fauna, and fungi. The
Molala The Molala (also Molale, Molalla, Molele) are a people of the Plateau culture area in the Oregon Cascades and central Oregon, United States. They are one of the Confederated Tribes of the Grand Ronde Community of Oregon, with 141 of the 882 member ...
people, one of the indigenous groups in the northwestern United States, historically inhabited the area around the volcano. Not much is known about Molala culture, other than that the group fished for salmon and collected berries, fruits,
obsidian Obsidian () is a naturally occurring volcanic glass formed when lava extrusive rock, extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Obsidian is produced from felsic lava, rich in the lighter elements s ...
, and dried herbs. David Douglas was the first person of non-indigenous descent to reach the area in 1825, followed by
Peter Skene Ogden Peter Skene Ogden (alternately Skeene, Skein, or Skeen; baptised 12 February 1790 – 27 September 1854) was a British-Canadian fur trader and an early explorer of what is now British Columbia and the Western United States. During his many expedi ...
the following year. The first group to ascend the volcano reached its summit in September 1923. Three Fingered Jack can still be climbed, but climbers can require rescue after becoming disoriented in low visibility conditions.


Geography

Three Fingered Jack lies in the U.S. state of
Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
, in
Linn Linn may refer to: People * Linn (surname) * Linn (given name) * Linn da Quebrada, stage name of Brazilian singer, actress, screenwriter and television personality Lina Pereira dos Santos (born 1990) Places Germany * Linn (Gangkofen), a part ...
and
Jefferson Jefferson may refer to: Names * Jefferson (surname) * Jefferson (given name) People * Thomas Jefferson (1743–1826), third president of the United States * Jefferson (footballer, born 1970), full name Jefferson Tomaz de Souza, Brazilian foo ...
counties. It has a volume of and a summit elevation of , with a proximal topographic
relief Relief is a sculptural method in which the sculpted pieces are bonded to a solid background of the same material. The term ''relief'' is from the Latin verb ''relevo'', to raise. To create a sculpture in relief is to give the impression that the ...
of and a draping relief of . Its jagged edifice rises between Mount Jefferson and the Three Sisters volcanic complex. Three Fingered Jack lies within the
Mount Jefferson Wilderness The Mount Jefferson Wilderness is a wilderness area located on and around Mount Jefferson in the central Cascade Range of Oregon in the United States. The wilderness lies within the Willamette National Forest and Deschutes National Forest. The wi ...
and is only accessible on foot by trails such as the
Pacific Crest Trail The Pacific Crest Trail (PCT), officially designated as the Pacific Crest National Scenic Trail, is a long-distance hiking and equestrian trail closely aligned with the highest portion of the Cascade and Sierra Nevada mountain ranges, which lie ...
. Located about northwest of the city of
Sisters A sister is a woman or a girl who shares one or more parents with another individual; a female sibling. The male counterpart is a brother. Although the term typically refers to a familial relationship, it is sometimes used endearingly to refer to ...
, it is a prominent landmark in the area.


Physical geography

Lateral and terminal
moraine A moraine is any accumulation of unconsolidated debris (regolith and rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a glacier or ice shee ...
s formed on Three Fingered Jack during the last major advance of glacial ice in the area during the
Wisconsin glaciation The Wisconsin Glacial Episode, also called the Wisconsin glaciation, was the most recent glacial period of the North American ice sheet complex. This advance included the Cordilleran Ice Sheet, which nucleated in the northern North American Cor ...
, along with
glacial striation Glacial striations or striae are scratches or gouges cut into bedrock by glacial abrasion. These scratches and gouges were first recognized as the result of a moving glacier in the late 18th century when Swiss alpinists first associated them w ...
s, altered vegetation patterns, and
lithologies The lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples, or with low magnification microscopy. Physical characteristics include colour, texture, grain size, and composition. Lit ...
that suggest glacial transport of material. Jack Glacier (unofficially-named) is the sole
glacier A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its Ablation#Glaciology, ablation over many years, often Century, centuries. It acquires dis ...
remaining on the volcano, located in a shaded
cirque A (; from the Latin word ') is an amphitheatre-like valley formed by glacial erosion. Alternative names for this landform are corrie (from Scottish Gaelic , meaning a pot or cauldron) and (; ). A cirque may also be a similarly shaped landform ...
on the northeast side. The glacier resides at an unusually low altitude for the central Oregon Cascades it is protected by tall ridges to the south and west. Jack Glacier has an area of , though historically it has reached estimated areas of up to . It is likely stagnant. During the
Little Ice Age The Little Ice Age (LIA) was a period of regional cooling, particularly pronounced in the North Atlantic region. It was not a true ice age of global extent. The term was introduced into scientific literature by François E. Matthes in 1939. Ma ...
, which spanned roughly 1350 to 1850, the glacier produced moraines with heights close to , which are dotted with of ash from the Sand Mountain cinder cone chain and of ash from the Blue Lake Crater cinder cone. The moraine for Jack Glacier dammed a lake with a volume of , a surface area of , and a maximum depth of . This lake was documented in 1937, although it did not appear on United States Geological Survey topographic maps made during the 1920s. The lake sits precariously; moraines on the volcano are steep, unstable, and populated with boulders. Before September 1960, there was a partial breach of this
moraine-dammed lake A moraine-dammed lake occurs when the terminal moraine has prevented some meltwater from leaving the valley. Its most common shape is that of a long ribbon (ribbon lake). Example of moraine dammed lakes include: *Argentina/Chile: General Carre ...
that covered an area of near the moraine's base. Since 1960, there have been at least three incidents in which moraine-dammed lakes on the volcano have caused floods down the slopes, including a significant flood and debris flow in 2012. Local soil is thin, and it has been buried by a layer of
weathered ''Weathered'' is the third studio album by American rock band Creed, released on November 20, 2001. It was the last Creed album to be released until '' Full Circle'' came out in October 2009, with Creed disbanding in June 2004. It is the only Cr ...
Holocene The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene togethe ...
tephra from Three Fingered Jack, which has a maximum thickness of .


Ecology

Douglas fir The Douglas fir (''Pseudotsuga menziesii'') is an evergreen conifer species in the pine family, Pinaceae. It is native to western North America and is also known as Douglas-fir, Douglas spruce, Oregon pine, and Columbian pine. There are three va ...
,
Alpine fir Alpine may refer to any mountainous region. It may also refer to: Places Europe * Alps, a European mountain range ** Alpine states, which overlap with the European range Australia * Alpine, New South Wales, a Northern Village * Alpine National Pa ...
,
blue spruce The blue spruce (''Picea pungens''), also commonly known as green spruce, Colorado spruce, or Colorado blue spruce, is a species of spruce tree. It is native to North America, and is found in USDA growing zones 1 through 7. It is found naturall ...
,
mountain hemlock ''Tsuga mertensiana'', known as mountain hemlock, is a species of hemlock native to the west coast of North America, found between Southcentral Alaska and south-central California. Description ''Tsuga mertensiana'' is a large evergreen conifer ...
, and
bear grass ''Xerophyllum tenax'' is a North American species of plants in the corn lily family. It is known by several common names, including bear grass, soap grass, quip-quip, and Indian basket grass. Ecology ''Xerophyllum tenax'' has flowers with si ...
can be found along the volcano and its hiking trails. Cascade parsley fern grows on Three Fingered Jack between elevations of . There are also mountain goats in the surrounding wilderness area.
Carnivorous A carnivore , or meat-eater (Latin, ''caro'', genitive ''carnis'', meaning meat or "flesh" and ''vorare'' meaning "to devour"), is an animal or plant whose food and energy requirements derive from animal tissues (mainly muscle, fat and other sof ...
animals in the surrounding area include
American black bear The American black bear (''Ursus americanus''), also called simply a black bear or sometimes a baribal, is a medium-sized bear endemic to North America. It is the continent's smallest and most widely distributed bear species. American black bear ...
s,
coyote The coyote (''Canis latrans'') is a species of canis, canine native to North America. It is smaller than its close relative, the wolf, and slightly smaller than the closely related eastern wolf and red wolf. It fills much of the same ecologica ...
s,
cougar The cougar (''Puma concolor'') is a large Felidae, cat native to the Americas. Its Species distribution, range spans from the Canadian Yukon to the southern Andes in South America and is the most widespread of any large wild terrestrial mamm ...
s,
red fox The red fox (''Vulpes vulpes'') is the largest of the true foxes and one of the most widely distributed members of the Order (biology), order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe ...
es,
raccoon The raccoon ( or , ''Procyon lotor''), sometimes called the common raccoon to distinguish it from other species, is a mammal native to North America. It is the largest of the procyonid family, having a body length of , and a body weight of ...
s,
American marten The American marten (''Martes americana''), also known as the American pine marten, is a species of North American mammal, a member of the family Mustelidae. The species is sometimes referred to as simply the pine marten. The name "pine marten" ...
s,
stoats The stoat (''Mustela erminea''), also known as the Eurasian ermine, Beringian ermine and ermine, is a mustelid native to Eurasia and the northern portions of North America. Because of its wide circumpolar distribution, it is listed as Least Conc ...
(also known as ermines),
long-tailed weasel The long-tailed weasel (''Neogale frenata''), also known as the bridled weasel, masked ermine, or big stoat, is a species of Mustelidae, mustelid distributed from southern Canada throughout all the United States and Mexico, southward through all ...
s,
American mink The American mink (''Neogale vison'') is a semiaquatic species of mustelid native to North America, though human intervention has expanded its range to many parts of Europe, Asia and South America. Because of range expansion, the American mink i ...
s,
North American river otter The North American river otter (''Lontra canadensis''), also known as the northern river otter and river otter, is a semiaquatic mammal that endemism, only lives on the North American continent, along its waterways and coasts. An adult North Amer ...
s, and
bobcat The bobcat (''Lynx rufus''), also known as the red lynx, is a medium-sized cat native to North America. It ranges from southern Canada through most of the contiguous United States to Oaxaca in Mexico. It is listed as Least Concern on the IUC ...
s. Deer species include
Roosevelt elk The Roosevelt elk (''Cervus canadensis roosevelti)'', also known commonly as the Olympic elk and Roosevelt's wapiti, is the largest of the four surviving subspecies of elk (''Cervus canadensis'') in North America by body mass (although by antle ...
,
black-tailed deer Two forms of black-tailed deer or blacktail deer that occupy coastal woodlands in the Pacific Northwest of North America are subspecies of the mule deer (''Odocoileus hemionus''). They have sometimes been treated as a species, but virtually all r ...
, and
mule deer The mule deer (''Odocoileus hemionus'') is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule. Two subspecies of mule deer are grouped into the black-tailed deer. Unlike the related whit ...
;
insectivore A robber fly eating a hoverfly An insectivore is a carnivorous animal or plant that eats insects. An alternative term is entomophage, which can also refer to the human practice of eating insects. The first vertebrate insectivores wer ...
s include
vagrant shrew The vagrant shrew (''Sorex vagrans''), also known as the wandering shrew, is a medium-sized North American shrew. At one time, the montane shrew and the Orizaba long-tailed shrew were considered to belong to the same species. Range and habitat ...
s,
American water shrew The American water shrew (''Sorex palustris'') or northern water shrew, is a shrew found in the nearctic faunal region located throughout the mountain ranges of the northern United States and in Canada and Alaska. The organism resides in semi-aq ...
s, and
coast mole The coast mole or Pacific mole (''Scapanus orarius'') is a medium-sized North American mole found in forested and open areas with moist soils along the Pacific coast from southwestern British Columbia to northwestern California. Taxonomy Two su ...
s.
Bat Bats are mammals of the order Chiroptera.''cheir'', "hand" and πτερόν''pteron'', "wing". With their forelimbs adapted as wings, they are the only mammals capable of true and sustained flight. Bats are more agile in flight than most bi ...
s at Jefferson include
little brown bat The little brown bat or little brown myotis (''Myotis lucifugus'') is an endangered species of mouse-eared microbat found in North America. It has a small body size and glossy brown fur. It is similar in appearance to several other mouse-ear ...
s and
silver-haired bat The silver-haired bat (''Lasionycteris noctivagans'') is a solitary migratory species of vesper bat in the family Vespertilionidae and the only member of the genus ''Lasionycteris''. Etymology The species name translates as night-wandering, ref ...
s, and
American pika The American pika (''Ochotona princeps''), a diurnality, diurnal species of pika, is found in the mountains of western North America, usually in boulder fields at or above the tree line. They are herbivorous, smaller relatives of rabbits and ha ...
s and
snowshoe hare The snowshoe hare (''Lepus americanus''), also called the varying hare or snowshoe rabbit, is a species of hare found in North America. It has the name "snowshoe" because of the large size of its hind feet. The animal's feet prevent it from sink ...
s are also present. Rodents such as
yellow-bellied marmot The yellow-bellied marmot (''Marmota flaviventris''), also known as the rock chuck, is a large, stout-bodied ground squirrel in the marmot genus. It is one of fourteen species of marmots, and is native to mountainous regions of southwestern Canad ...
s,
mountain beaver The mountain beaver (''Aplodontia rufa'')Other names include mountain boomer, ground bear, giant mole, gehalis, lesser sasquatch, sewellel, suwellel, showhurll, showtl, and showte, as well as a number of Chinookan and other Native American terms ...
s,
yellow-pine chipmunk The yellow-pine chipmunk (''Neotamias amoenus'') is a species of order Rodentia in the family Sciuridae. It is found in western North America: parts of Canada and the United States. These chipmunks are normally found in brush-covered areas, and ...
s,
Townsend's chipmunk Townsend's chipmunk (''Neotamias townsendii'') is a species of rodent in the squirrel family, Sciuridae. It lives in the forests of the Pacific Northwest of North America, from extreme southwestern British Columbia through western Washington and ...
s,
golden-mantled ground squirrel The golden-mantled ground squirrel (''Callospermophilus lateralis'') is a ground squirrel native to western North America. It is distributed in the Rocky Mountains of British Columbia and Alberta, and through much of the western United States. ...
s,
western gray squirrel The western gray squirrel (''Sciurus griseus'') is a tree squirrel found along the western coast of the United States and Mexico. In some places, this species has also been known as the silver-gray squirrel, the California gray squirrel, the Or ...
s,
Douglas squirrel The Douglas squirrel (''Tamiasciurus douglasii'') is a pine squirrel found in the Pacific Northwest of North America, including the northwestern coastal states of the United States as well as the southwestern coast of British Columbia in Canada, ...
s,
mountain pocket gopher The mountain pocket gopher (''Thomomys monticola'') is a species of rodent in the family Geomyidae. It is endemic to California and Nevada Nevada ( ; ) is a state in the Western region of the United States. It is bordered by Oregon to the ...
s,
North American beaver The North American beaver (''Castor canadensis'') is one of two Extant taxon, extant beaver species, along with the Eurasian beaver (''Castor fiber''). It is native to North America and introduced in South America (Patagonia) and Europe (primari ...
s,
deer mice Deer or true deer are hoofed ruminant mammals forming the family Cervidae. The two main groups of deer are the Cervinae, including the muntjac, the elk (wapiti), the red deer, and the fallow deer; and the Capreolinae, including the reindeer ...
,
bushy-tailed woodrat The bushy-tailed woodrat, or packrat (''Neotoma cinerea'') is a species of rodent in the family Cricetidae found in Canada and the United States. Its natural habitats are boreal forests, temperate forests, dry savanna, temperate shrubland, and t ...
s, water voles, Pacific jumping mice, and
North American porcupine The North American porcupine (''Erethizon dorsatum''), also known as the Canadian porcupine, is a large quill-covered rodent in the New World porcupine family. It is the second largest rodent in North America, after the North American beaver (''C ...
s are present. Birds nearby include
mallard The mallard () or wild duck (''Anas platyrhynchos'') is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa, and has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Arge ...
s,
northern goshawk The northern goshawk (; ''Accipiter gentilis'') is a species of medium-large bird of prey, raptor in the Family (biology), family Accipitridae, a family which also includes other extant diurnal raptors, such as eagles, buzzards and harrier (bird) ...
s,
sharp-shinned hawk The sharp-shinned hawk (''Accipiter striatus'') is a small hawk, with males being the smallest hawks in the United States and Canada, but with the species averaging larger than some Neotropical realm, Neotropical species, such as the tiny hawk. ...
s,
red-tailed hawk The red-tailed hawk (''Buteo jamaicensis'') is a bird of prey that breeds throughout most of North America, from the interior of Alaska and northern Canada to as far south as Panama and the West Indies. It is one of the most common members with ...
s,
dusky grouse The dusky grouse (''Dendragapus obscurus'') is a species of forest-dwelling grouse native to the Rocky Mountains in North America.del Hoyo, J., Elliott, A., & Sargatal, J., eds. (1994). ''Handbook of the Birds of the World'' 2: 401-402. Lynx Edi ...
s,
grey partridge The grey partridge (''Perdix perdix''), also known as the gray-legged partridge, English partridge, Hungarian partridge, or hun, is a gamebird in the pheasant family Phasianidae of the order Galliformes, gallinaceous birds. The scientific name ...
s,
killdeer The killdeer (''Charadrius vociferus'') is a large plover found in the Americas. It was described and given its current scientific name in 1758 by Carl Linnaeus in the 10th edition of his ''Systema Naturae''. Three subspecies are described. T ...
s,
spotted sandpiper The spotted sandpiper (''Actitis macularius'') is a small shorebird. Together with its sister species the common sandpiper (''A. hypoleucos''), it makes up the genus ''Actitis''. They replace each other geographically; stray birds may settle dow ...
s,
California gull The California gull (''Larus californicus'') is a medium-sized gull, smaller on average than the herring gull but larger on average than the ring-billed gull, though it may overlap in size greatly with both. Description Adults are similar in ap ...
s,
band-tailed pigeon The band-tailed pigeon (''Patagioenas fasciata'') is a medium-sized bird of the Americas. Its closest relatives are the Chilean pigeon and the ring-tailed pigeon, which form a clade of ''Patagioenas'' with a terminal tail band and iridescent pl ...
s,
great horned owl The great horned owl (''Bubo virginianus''), also known as the tiger owl (originally derived from early naturalists' description as the "winged tiger" or "tiger of the air"), or the hoot owl, is a large owl native to the Americas. It is an extrem ...
s,
mountain pygmy owl The mountain pygmy owl (''Glaucidium gnoma'') is a small species of owl from the family Strigidae. They reside throughout southern Arizona, New Mexico and Mexico. There is current taxonomic debate regarding its classification as an independent s ...
s,
common nighthawk The common nighthawk (''Chordeiles minor'') is a medium-sized crepuscular or nocturnal bird of the Americas within the nightjar family, whose presence and identity are best revealed by its vocalization. Typically dark (gray, black and brown), ...
s, rufous hummingbirds,
Northern flicker The northern flicker or common flicker (''Colaptes auratus'') is a medium-sized bird of the woodpecker family. It is native to most of North America, parts of Central America, Cuba, and the Cayman Islands, and is one of the few woodpecker spec ...
s,
pileated woodpecker The pileated woodpecker (''Dryocopus pileatus'') is a large, mostly black woodpecker native to North America. An insectivore, it inhabits deciduous forests in eastern North America, the Great Lakes, the boreal forests of Canada, and parts of the ...
s,
yellow-bellied sapsucker The yellow-bellied sapsucker (''Sphyrapicus varius'') is a medium-sized woodpecker that breeds in Canada and the northeastern United States. Taxonomy The yellow-bellied sapsucker was described and illustrated using a hand-coloured plate by the E ...
s,
hairy woodpecker The hairy woodpecker (''Leuconotopicus villosus'') is a medium-sized woodpecker that is found over a large area of North America. It is approximately in length with a wingspan. With an estimated population in 2020 of almost nine million individ ...
s, and
white-headed woodpecker The white-headed woodpecker (''Leuconotopicus albolarvatus'') is a non-migratory woodpecker that resides in pine forests of the mountains of western North America. Description It has a black body (approximately long) and white head. It has whit ...
s. Other bird species found in the area consist of
Eurasian three-toed woodpecker The Eurasian three-toed woodpecker (''Picoides tridactylus'') is a medium-sized woodpecker that is found from northern Europe across northern Asia to Japan. Taxonomy The Eurasian three-toed woodpecker was formally described in 1758 by the Swedi ...
s,
willow flycatcher The willow flycatcher (''Empidonax traillii'') is a small insect-eating, neotropical migrant bird of the tyrant flycatcher family. There are four subspecies of the willow flycatcher currently recognized, all of which breed in North America (inc ...
s,
olive-sided flycatcher The olive-sided flycatcher (''Contopus cooperi'') is a small to medium sized passerine bird in the family Tyrannidae, the Tyrant flycatcher family. It is a migratory species that travels from South to North America to breed during the summer. It ...
s,
tree swallow The tree swallow (''Tachycineta bicolor'') is a migratory bird of the family Hirundinidae. Found in the Americas, the tree swallow was first described in 1807 by French ornithologist Louis Vieillot as ''Hirundo bicolor''. It has since been mov ...
s,
Canada jay The Canada jay (''Perisoreus canadensis''), also known as the gray jay, grey jay, camp robber, or whisky jack, is a passerine bird of the family Corvidae. It is found in boreal forests of North America north to the tree line, and in the Rock ...
s,
Steller's jay Steller's jay (''Cyanocitta stelleri'') is a bird native to western North America and the mountains of Central America, closely related to the blue jay found in eastern North America. It is also known as the long-crested jay, mountain jay, and pin ...
s,
common raven The common raven (''Corvus corax'') is a large all-black passerine bird. It is the most widely distributed of all corvids, found across the Northern Hemisphere. It is a raven known by many names at the subspecies level; there are at least e ...
s,
Clark's nutcracker Clark's nutcracker (''Nucifraga columbiana''), sometimes referred to as Clark's crow or woodpecker crow, is a passerine bird in the family Corvidae, native to the mountains of western North America. The nutcracker is an omnivore, but subsists mai ...
s,
black-capped chickadee The black-capped chickadee (''Poecile atricapillus'') is a small, non-migratory, North American songbird that lives in deciduous and mixed forests. It is a passerine bird in the tit family, the Paridae. It is the state bird of Massachusetts and ...
s,
mountain chickadee The mountain chickadee (''Poecile gambeli'') is a small songbird, a passerine bird in the tit family Paridae. Taxonomy The specific name honors naturalist William Gambel. The mountain chickadee was formerly placed in the genus ''Parus'' with ...
s,
chestnut-backed chickadee The chestnut-backed chickadee (''Poecile rufescens''), formerly ''Parus rufescens'', is a small passerine bird in the tit family, Paridae. It is found in the Pacific Northwest of the United States and western Canada, from southern Alaska to sout ...
s,
red-breasted nuthatch The red-breasted nuthatch (''Sitta canadensis'') is a small songbird. The adult has blue-grey upperparts with cinnamon underparts, a white throat and face with a black stripe through the eyes, a straight grey bill and a black crown. Its call, wh ...
es,
pygmy nuthatch The pygmy nuthatch (''Sitta pygmaea'') is a tiny songbird, about long and about 10 grams in weight. Description Measurements: * Length: * Weight: * Wingspan: It ranges from southern British Columbia south through various discontinuo ...
es,
Eurasian treecreeper The Eurasian treecreeper or common treecreeper (''Certhia familiaris'') is a small passerine bird also known in the British Isles, where it is the only living member of its genus, simply as treecreeper. It is similar to other treecreepers, and ha ...
s,
American dipper The American dipper (''Cinclus mexicanus''), also known as a water ouzel, is a stocky dark grey bird with a head sometimes tinged with brown, and white feathers on the eyelids that cause the eyes to flash white as the bird blinks. It is long, h ...
s,
wrens Wrens are a family of brown passerine birds in the predominantly New World family Troglodytidae. The family includes 88 species divided into 19 genera. Only the Eurasian wren occurs in the Old World, where, in Anglophone regions, it is comm ...
,
American robin The American robin (''Turdus migratorius'') is a migratory bird of the true thrush genus and Turdidae, the wider thrush family. It is named after the European robin because of its reddish-orange breast, though the two species are not closel ...
s, varied thrushes,
hermit thrush The hermit thrush (''Catharus guttatus'') is a medium-sized North American thrush. It is not very closely related to the other North American migrant species of ''Catharus'', but rather to the Mexican russet nightingale-thrush. The specific na ...
es,
Townsend's solitaire Townsend's solitaire (''Myadestes townsendi'') is a medium-sized thrush, the only solitaire native to America north of Mexico. Range and habitat This solitaire ranges from southern Alaska, British Columbia and Alberta to northern Zacatecas in Me ...
s,
golden-crowned kinglet The golden-crowned kinglet (''Regulus satrapa'') is a very small songbird in the family Regulidae that lives throughout much of North America. Description Adults are olive-gray on the upperparts with white underparts, with thin bills and shor ...
s,
ruby-crowned kinglet The ruby-crowned kinglet (''Corthylio calendula'') is a very small passerine bird found throughout North America. It is a member of the kinglet family. The bird has olive-green plumage with two white wing bars and a white eye-ring. Males have a r ...
s,
water pipit The water pipit (''Anthus spinoletta'') is a small passerine bird which breeds in the mountains of Southern Europe and the Palearctic eastwards to China. It is a short-distance migrant; many birds move to lower altitudes or wet open lowlands i ...
s,
blue-headed vireo The blue-headed vireo (''Vireo solitarius'') is a Neotropical migrating song bird found in North and Central America. There are currently two recognized subspecies that belong to the blue-headed vireo. It has a range that extends across Canada an ...
s,
western tanager The western tanager (''Piranga ludoviciana''), is a medium-sized American songbird. Formerly placed in the tanager family (Thraupidae), other members of its genus and it are classified in the cardinal family (Cardinalidae). The species's plumag ...
s,
Cassin's finch Cassin's finch (''Haemorhous cassinii'') is a bird in the finch family, Fringillidae. This species and the other "American rosefinches" are placed in the genus ''Haemorhous''. Description Measurements: * Length: 6.3 in (16 cm) * Weight: 0.8-1 ...
es, gray-crowned rosy finches,
pine siskin The pine siskin (''Spinus pinus'') is a North American bird in the finch family. It is a migratory bird with an extremely sporadic winter range. Taxonomy The pine siskin was formally described in 1810 by the American ornithologist Alexander ...
s,
red crossbill The red crossbill or common crossbill (''Loxia curvirostra'') is a small passerine bird in the finch family Fringillidae. Crossbills have distinctive mandibles, crossed at the tips, which enable them to extract seeds from conifer cones and other ...
s,
green-tailed towhee The green-tailed towhee (''Pipilo chlorurus'') is the smallest towhee, but is still one of the larger members of the American sparrow family Passerellidae. Its breeding range covers most of the interior Western United States, with a winter rang ...
s,
dark-eyed junco The dark-eyed junco (''Junco hyemalis'') is a species of junco, a group of small, grayish New World sparrows. This bird is common across much of temperate North America and in summer ranges far into the Arctic. It is a very variable species, much ...
s,
white-crowned sparrow The white-crowned sparrow (''Zonotrichia leucophrys'') is a species of passerine bird native to North America. A medium-sized member of the New World sparrow family, this species is marked by a grey face and black and white streaking on the uppe ...
s, golden-crowned sparrows,
fox sparrow The fox sparrow (''Passerella iliaca'') is a large New World sparrow. It is the only member of the genus ''Passerella'', although some authors split the species into four (see below). Taxonomy More specific information regarding plumage is avai ...
s, and
Lincoln's sparrow Lincoln's sparrow (''Melospiza lincolnii'') is a small American sparrow, sparrow native to North America. It is a less common passerine bird that often stays hidden under thick ground cover, but can be distinguished by its sweet, wrenlike song. Li ...
s.
Long-toed salamander The long-toed salamander (''Ambystoma macrodactylum'') is a mole salamander in the family Ambystomatidae. This species, typically long when mature, is characterized by its mottled black, brown, and yellow pigmentation, and its long outer fourth ...
s,
California giant salamander The California giant salamander (''Dicamptodon ensatus'') is a species of salamander in the family Ambystomatidae. ''Dicamptodon ensatus'' is endemic to California, in the western United States. The species once additionally included individuals ...
s,
rough-skinned newt The rough-skinned newt or roughskin newt (''Taricha granulosa'') is a North American newt known for the strong toxin exuded from its skin. Appearance A stocky newt with rounded snout, it ranges from light brown to olive or brownish-black on t ...
s,
tailed frog The tailed frogs are two species of frogs in the genus ''Ascaphus'', the only taxon in the family Ascaphidae . The "tail" in the name is actually an extension of the male cloaca. The tail is one of two distinctive anatomical features adapting the ...
s,
western toad The western toad (''Anaxyrus boreas'') is a large toad species, between long, native to western North America. ''A. boreas'' is frequently encountered during the wet season on roads, or near water at other times. It can jump a considerable distan ...
s,
Pacific tree frog The Pacific tree frog (''Pseudacris regilla''), also known as the Pacific chorus frog, has a range spanning the Pacific Northwest, from Northern California, Oregon, and Washington to British Columbia in Canada and extreme southern Alaska. They l ...
s,
northern red-legged frog The northern red-legged frog (''Rana aurora'') is a species of amphibian, whose range is the coastal region stretching from southwest British Columbia to southern Mendocino County in Northern California, and is protected in Oregon and Californ ...
s,
Oregon spotted frog The Oregon spotted frog (''Rana pretiosa'', meaning "precious frog") is a member of the frog family Ranidae of order Anura. It is a medium-sized aquatic frog endemic to the Pacific Northwest and historically well distributed in the Puget Trough/ ...
s, pygmy short-horned lizards,
common garter snake The common garter snake (''Thamnophis sirtalis'') is a species of thamnophis snake, in the natricine subfamily, which is indigenous to North America and found widely across the continent. Most common garter snakes have a pattern of yellow strip ...
s, and northwestern garter snakes make up some of the amphibious and reptilian animals in the vicinity.


Geology and subfeatures

Three Fingered Jack is a shield volcano, and it is part of the group of volcanoes known as
Oregon's Matterhorns Oregon's Matterhorns is an informal group of volcanoes in the Cascade Range, in the American state of Oregon, named after the original Matterhorn. The Pacific Crest Trail passes near all of the volcanoes which constitute Oregon's Matterhorns. O ...
, whose tall, pinnacle spires resemble the
Matterhorn The (, ; it, Cervino, ; french: Cervin, ; rm, Matterhorn) is a mountain of the Alps, straddling the main watershed and border between Switzerland and Italy. It is a large, near-symmetric pyramidal peak in the extended Monte Rosa area of the ...
in
Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...
. The volcano (like
Mount Thielsen Mount Thielsen, or Big Cowhorn ( Klamath: hisc’akwaleeʔas), is an extinct shield volcano in the Oregon High Cascades, near Mount Bailey. Because eruptive activity ceased 250,000 years ago, glaciers have heavily eroded the volcano's st ...
, Mount Bailey, Diamond Peak, and
Mount Washington Mount Washington is the highest peak in the Northeastern United States at and the most topographically prominent mountain east of the Mississippi River. The mountain is notorious for its erratic weather. On the afternoon of April 12, 1934, ...
) had a shorter lifespan than larger volcanoes in the Cascade Range, ceasing eruptive activity more than 100,000 years ago. Three Fingered Jack marks the northernmost point for this group. South of Mount Jefferson, the High Cascades of Oregon consist of a broad
ridge A ridge or a mountain ridge is a geographical feature consisting of a chain of mountains or hills that form a continuous elevated crest for an extended distance. The sides of the ridge slope away from the narrow top on either side. The line ...
produced by
shield volcano A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more v ...
activity and eruptions from cinder cones. Vents range from deeply eroded complexes to recently active volcanoes, with most of the region mantled by normally polarized rock produced within the past 730,000 years. Three Fingered Jack is part of a group of more than 30 large shield volcanoes and stratovolcanoes that form a segment of Pleistocene-to-Holocene-
epoch In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided by ...
volcanic vents that produced
mafic A mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include ...
lava (rich in magnesium and iron). Three Fingered Jack includes several overlapping cinder cones and composite cones over underlying lava flows from shield volcano activity. These volcanic edifices and their lava flow deposits cover an area of . The major edifice, which consists of light gray,
basaltic andesite Basaltic andesite is a volcanic rock that is intermediate in composition between basalt and andesite. It is composed predominantly of augite and plagioclase. Basaltic andesite can be found in volcanoes around the world, including in Central Ameri ...
lava flow deposits, sits to the west of the first tephra cone. Variegated
pyroclastic rock Pyroclastic rocks (derived from the el, πῦρ, links=no, meaning fire; and , meaning broken) are clastic rocks composed of rock fragments produced and ejected by explosive volcanic eruptions. The individual rock fragments are known as pyrocl ...
is embedded among these flows. Element abundance analysis suggests that lava in the Three Fingered Jack area can be grouped into discrete units based on its source magma chamber, except for the Jorn Lake basalt produced by the underlying shield volcano and basaltic andesite erupted by Three Fingered Jack. Petrological analysis shows high and low pressures for the crystallization of these lava flow deposits, and that basaltic andesite was distinct from basalt due to longer fractionation times. Though Three Fingered Jack does not have a high-level conduit-filling volcanic plug, its summit sits atop a pyroclastic cone. Another cone lies to the south of the major cone, and there are secondary craters on the sides, as well as radial dikes and
volcanic plug A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile-charged mag ...
s. Known subfeatures include two shield volcanoes, Maxwell Butte (less eroded than Three Fingered Jack) and Turpentine Peak, which have elevations of and , respectively. There are six additional known volcanic cones: Duffy Butte, at an elevation of ; Hogg Rock (a
tuya A tuya is a flat-topped, steep-sided volcano formed when lava erupts through a thick glacier or ice sheet. They are rare worldwide, being confined to regions which were covered by glaciers and had active volcanism during the same period. As lava ...
), at an elevation of ; Marion Mountain, at an elevation of ; Red Butte, with an elevation of ; and Marion Peak and Saddle Mountain, which do not have elevations listed. Other shield volcanoes and cinder cones that were active during the Pleistocene epoch occur to the northwest and southwest. The volcano has a long ridge that trends from north to south. It is highly eroded; shaped like a sawtooth, it consists of
tephra Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism. Volcanologists also refer to airborne fragments as pyroclasts. Once clasts have fallen to the ground, they rem ...
deposits supported by a vertical
dike Dyke (UK) or dike (US) may refer to: General uses * Dyke (slang), a slang word meaning "lesbian" * Dike (geology), a subvertical sheet-like intrusion of magma or sediment * Dike (mythology), ''Dikē'', the Greek goddess of moral justice * Dikes ...
with a thickness of . Erosion has been so extensive that climbers claim that the summit moves in the wind. During the Pleistocene epoch, glaciers exposed its inner contents, providing evidence for its eruptive history. Though it has not been dated by radiometric approaches, the volcano is likely between 500,000 and 250,000 years old, and has been carved out by at least three glacial periods.


Eruptive history

Three Fingered Jack has an eruptive history similar to many High Cascade volcanoes. The first activity was the formation of a pyroclastic cone over shield volcanoes. Later eruptions formed a main volcanic cone from lava flows and more pyroclastic rock. There are dikes that radiate from a micronorite plug, which deformed tephra in the surrounding strata. The northern and southern flanks of Three Fingered Jack feature lava flows made of olivine and augite basalt. Three Fingered Jack is estimated to be between 500,000 and 250,000 years old. It underwent more
explosive eruption In volcanology, an explosive eruption is a volcanic eruption of the most violent type. A notable example is the 1980 eruption of Mount St. Helens. Such eruptions result when sufficient gas has dissolved under pressure within a viscous magma such ...
s as its eruptive history progressed, generating large amounts of tephra which created a loose, unconsolidated summit and upper cone. Lava flows near the summit have an average thickness of . Secondary volcanic craters produced lava flows and pyroclastic material, which traveled both north and south of the volcano. Cone-building eruptions ceased before the Pleistocene epoch's
glacial period A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate betw ...
, allowing the expanded glacial cover to remove most of the cone, especially on the eastern and northeastern sides. During the ongoing Holocene epoch, there has been volcanic activity between the Three Sisters volcanoes and Three Fingered Jack. Such eruptive episodes have produced tephra and lava flows that cover several hundred square kilometers in the region. These eruptions occurred after the climactic eruption of
Mount Mazama Mount Mazama (''Giiwas'' in the Native American language Klamath language, Klamath) is a complex volcano in the state of Oregon, United States, in a segment of the Cascade Volcanoes, Cascade Volcanic Arc and Cascade Range. Most of the mountai ...
, which took place roughly 6,600 years ago.


Human history

The
Molala The Molala (also Molale, Molalla, Molele) are a people of the Plateau culture area in the Oregon Cascades and central Oregon, United States. They are one of the Confederated Tribes of the Grand Ronde Community of Oregon, with 141 of the 882 member ...
people traditionally inhabited the surrounding area. The Molala fished for salmon and collected berries, fruits,
obsidian Obsidian () is a naturally occurring volcanic glass formed when lava extrusive rock, extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Obsidian is produced from felsic lava, rich in the lighter elements s ...
, and dried herbs. Their culture was not well documented. The first person of non-indigenous descent to reach the area was David Douglas in 1825, followed by
Peter Skene Ogden Peter Skene Ogden (alternately Skeene, Skein, or Skeen; baptised 12 February 1790 – 27 September 1854) was a British-Canadian fur trader and an early explorer of what is now British Columbia and the Western United States. During his many expedi ...
the following year. Sources disagree about the affiliation of the mountain's first ascenders, some calling them "the Boys from Bend," others saying they were members of the
Mazamas The Mazamas () is a mountaineering organization based in Portland, Oregon, United States, founded in 1894. Promotion of mountaineering The Mazamas has been an important part of the climbing community in the Pacific Northwest of the United States ...
mountaineering club. Nonetheless, a source written by one of these first ascenders clearly states who was in the party and when they climbed. Ervin McNeal, Phil Philbrook, Armin Furrer, Wilbur Watkins, Leo Harryman, and Ronald Sellars were the first to ascend Three Fingered Jack on September 3, 1923. The origins of Three Fingered Jack's name remain unclear. One account claims that the volcano received its name from
Joaquin Murrieta Joaquin Murrieta Carrillo (sometimes spelled Murieta or Murietta) (1829 – July 25, 1853), also called the Robin Hood of the West or the Robin Hood of El Dorado, was a Mexican-American figure of disputed historicity. The novel '' The Life and A ...
, a gold miner and vaquero during the
California Gold Rush The California Gold Rush (1848–1855) was a gold rush that began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California fro ...
also known as Three Fingered Jack. Others allege that the volcano was named after a trapper with less than five fingers on one of his hands.


Recreation

Hikers can see Three Fingered Jack on trails surrounding the mountain. The Canyon Creek Meadows hiking trail begins at Jack Lake, progresses through the Mount Jefferson Wilderness, and runs for about . It has an elevation gain of , and is accessible to children and families. An additional connected hiking trail runs for another up the rocky glacial washout plain adjacent to the volcano, becoming steeper as it approaches Three Fingered Jack and gaining in elevation. The base can also be reached on Pacific Crest Trail which runs for round trip and offers views of the volcano and its summit lake. Moreover, the Three Fingered Jack loop trail runs for around the volcano, gaining in elevation. When Three Fingered Jack's face becomes foggy, climbers have become disoriented due to the low visibility conditions of climbing the mountain, requiring rescue. The summit can be quite dangerous due steep cliffs and poor rock quality which can result in footing and hand holds giving way without warning. One such event occurred on July 19, 2020, resulting in the death of a hiker attempting to reach the summit.


Notes


References


Sources

* * * * * * * * * * * * * * * * *


External links

* {{Authority control Shield volcanoes of the United States Cascade Range Volcanoes of Oregon Mountains of Oregon Landmarks in Oregon Subduction volcanoes Cascade Volcanoes Extinct volcanoes of the United States Pleistocene shield volcanoes Mountains of Linn County, Oregon Landforms of Jefferson County, Oregon Willamette National Forest Deschutes National Forest Polygenetic shield volcanoes Volcanoes of Linn County, Oregon Volcanoes of the United States