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Marble Canyon (Canadian Rockies)
Marble Canyon is a canyon surrounding Tokumm Creek just above its confluence with the Vermilion River, at the north end of Kootenay National Park in the Canadian Rockies of British Columbia, Canada. South of Marble Canyon on Highway 93 is Numa Falls on the Vermillion River. As described by ''Canadian Alpine Journal'' in 1913, " okumm Creekjoins Vermillion River through a magnificent gorge, or box canyon, so narrow that at several places the fissure, for it seems little more than a crack in the rock strata, is bridged by great boulders that have become wedged across it. It was a feature well worth seeing." Cambrian Lagerstatte A major new find was announced in early 2014 of fossilized Cambrian soft-bodied organisms in or near Marble Canyon that rival or even surpass the nearby Burgess Shale fossil site in size and preservation. The report said that 22% of the observed species found in the initial excavation were new to science. Additionally, several species previously known o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Looking Up At Entrance To Marble Canyon - Panoramio
Looking is the act of intentionally focusing visual perception on someone or something, for the purpose of obtaining information, and possibly to convey interest or another sentiment. A large number of troponyms exist to describe variations of looking at things, with prominent examples including the verbs "stare, gaze, gape, gawp, gawk, goggle, glare, glimpse, glance, peek, peep, peer, squint, leer, gloat, and ogle".Anne Poch Higueras and Isabel Verdaguer Clavera, "The rise of new meanings: A historical journey through English ways of ''looking at''", in Javier E. Díaz Vera, ed., ''A Changing World of Words: Studies in English Historical Lexicography, Lexicology and Semantics'', Volume 141 (2002), p. 563-572. Additional terms with nuanced meanings include viewing, Madeline Harrison Caviness, ''Visualizing Women in the Middle Ages: Sight, Spectacle, and Scopic Economy'' (2001), p. 18. watching,John Mowitt, ''Sounds: The Ambient Humanities'' (2015), p. 3. eyeing,Charles John Smi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metaspriggina NT Small
''Metaspriggina'' is a genus of chordate initially known from two specimens in the Middle Cambrian Burgess Shale and 44 specimens found in 2012 at the Marble Canyon bed in Kootenay National Park. Whilst named after the Ediacaran organism ''Spriggina'', later work has shown the two to be unrelated. ''Metaspriggina'' is considered to represent a primitive chordate, possibly transitional between cephalochordates and the earliest vertebrates, albeit this has been questioned because it seems to possess most of the characteristics attributed to craniates. It lacked fins and it had a weakly developed cranium, but it did possess two well-developed upward-facing eyes with nostrils behind them. ''Metaspriggina'' also possessed a notochord, along with seven pairs of pharyngeal bars, possibly made of cartilage. Surprisingly they were not formed from a singular bone, but they were formed of multiple separate pairs of bones, along with first two of them that were enlarged compared t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sidneyia
''Sidneyia'' is an extinct arthropod known from fossils found from the Early Cambrian-age Maotianshan Shales to the Mid Cambrian Burgess Shale formation of British Columbia. 144 specimens of ''Sidneyia'' are known from the Greater Phyllopod bed, where they comprise 0.27% of the community. General description ''Sidneyia'' ranged from in length and is one of the largest arthropods found at the site. It is thought to have been a benthic carnivore and scavenger that walked along the sea floor in search of hard-shelled prey. Gut contents have revealed that ''Sidneyia'' fed largely on small trilobites, as well as on brachiopods, hyoliths and small arthropods. The gut was narrow, but widens posteriorly to form a pocket where digestion presumably took place. The retention of feces likely indicates infrequent feeding Its exquisitely preserved gnathobases resemble those of ''Limulus'', and were probably used to crush prey. ''Sidneyia'' was discovered in 1910 during the first day of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollisonia
''Mollisonia'' is an extinct genus of Cambrian arthropod. Species are known from the Burgess Shale, Langston Formation, and Wheeler Shale of North America, as well as the Chengjiang Biota of China. Twenty-one specimens of ''Mollisonia'' are known from the Greater Phyllopod bed, where they comprise less than 0.1% of the community. Remains possibly attributable to the genus are also known from the Ordovician Fezouata Formation of Morocco and Bøggild Fjord Formation Greenland. An observation published in 2019 suggests this genus is a basal chelicerate, closer to crown group Chelicerata than members of Habeliida. It is suggested to be closely related to '' Corcorania'', ''Urokodia'', and ''Thelxiope'', which together form the clade Mollisoniida, which are thought to be closely related to Chelicerata The subphylum Chelicerata (from New Latin, , ) constitutes one of the major subdivisions of the phylum Arthropoda. It contains the sea spiders, horseshoe crabs, and arachnids (in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alalcomenaeus
''Alalcomenaeus'' is one of the most widespread and longest-surviving arthropod genera of the Early and Middle Cambrian. Known from over 300 specimens in the Burgess Shale and the Chengjiang biota. it is a member of the group Megacheira. Morphology ''Alalcomenaeus'' had three median eyes; two stalked, more lateral eyes; a triflagellate great appendage; and two more head appendages posterior to that. Like its body appendages, these were biramous—their inner branch was spiny, segmented, flexible and leg-like, while the outer portion had a large surface area and resembled a flap. ''Alalcomenaeus'' reached about 6 cm in length, although many smaller specimens are known. Its head was covered with a shield, and its eleven body segments were also covered with an exoskeleton. Its body terminated with a paddle-like telson ("tail") which probably helped to propel the organism; this ended with long flat spikes in the plane of the tail fin. Ecology The organism probably swam, waft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yawunik
''Yawunik'' is an extinct genus of Cambrian megacheiran ("Great appendage" arthropod) known from the Burgess Shale in Canada (Marble Canyon locality). The type species has been named ''Yawunik kootenayi'' after the Kootenay, both a geographic area (and National Park, where the fossil was found) and North American First Nation, also known as the Ktunaxa. Yawunik is the name of a primordial sea monster in Ktunaxa mythology. The fossil dates back to 508 million years ago. Description ''Yawunik'' had large size for megacheiran, up to long not including great appendage. It had four eyes, in the anteriormost position of the head, and lateral eyes are larger. ''Yawunik'' differs from other leanchoilid such as ''Leanchoilia ''Leanchoilia'' is an megacheiran arthropod known from Cambrian deposits of the Burgess Shale in Canada and the Chengjiang biota of China. It was about long and had long, whip-like feelers mounted on frontal arm-like appendages. Its internal o ...'' by havi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surusicaris
''Surusicaris'' is an extinct genus of bivalved arthropod, known from the Cambrian Burgess Shale of British Columbia, Canada. It is considered to be closely related to ''Isoxys,'' and like it has spined grasping frontal appendages. Description The only known specimen (ROM 62976), has a roughly semicircular bivalved carapace, which is approximately long and tall. The head has a pair of rounded eyes, and a pair of upward-curling segmented frontal appendages with at least five segments, the second, third and fourth of which bear a spine, with three long spines and at least one short spine on the fifth and terminal segment. The head also has three pairs of other limbs, which are stubby, uniramous and unsclerotised, with an annulated appearance, which are tipped with bifid claws. Along the trunk are 12 pairs of biramous limbs, which taper in size posteriorly. Their morphology is simple, the morphology of the endopod is similar to those of the anterior three uniramous head limbs, whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuzoia
''Tuzoia'' (from Mount Tuzo, a mountain in the Canadian Rockies) is an extinct genus of large bivalved arthropod known from Early to Middle Cambrian marine environments from what is now North America, Australia, China, Europe and Siberia. The large, domed carapace reached lengths of , making them amongst the largest known Cambrian arthropods. Description The largest carapaces of ''Tuzoia'' are known to reach in length, suggesting a total body length of approximately . Along the sides of the carapace a spiked ridge is present, and the edges and midline of the carapace are also spiked in many species. These spines likely functioned to aid stability while swimming. The carapaces are marked with a reticulate (net-like) pattern, which was likely to increase the structural integrity of the valves while remaining lightweight. The head had a anterior/ocular sclerite at the top, a single pair of large stalked eyes, and a pair of segmented antennae. The head has pairs of cephalic append ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pakucaris
''Pakucaris'' is an extinct genus of bivalved arthropod known from a single species, ''Pakucaris apatis'', found in the Marble Canyon locality of the Burgess Shale in British Columbia, Canada. It is thought to be a member of Hymenocarina. Unlike other members of that group, the posterior segments are covered with a separate pygidium The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is compo ... shield, covergent on other arthropods like artiopods. Specimens range in length from . The main bivalved carapace covers around 80% of the body, with the pygidium covering the remaining 20%. The head has a forward and downward facing pair of moderately sized eyes on short stalks, along with three pairs of cephalic appendages. The thorax has either 30-35 or 70-80 segments, depending on the specimen, whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fibulacaris
''Fibulacaris'' is a monotypic genus of fossil arthropod known only by one species, ''Fibulacaris nereidis'', discovered from the Cambrian Burgess Shale of Canada It was characterized by a bivalved carapace with an inverted rostrum, sandwiching the slender body with stalked eyes and homonomous appendages. It was probably an actively swimming filter feeder and possibly swam upside-down like some branchiopod crustaceans and horseshoe crabs. Phylogenetic analysis suggest it was a relative or member of Hymenocarina Hymenocarina is an order of extinct arthropods known from the Cambrian. They possess bivalved carapaces, typically with exposed posteriors. Members of the group are morphologically diverse and had a variety of ecologies, including as filter feede ..., which contains other bivalved arthropods. References Burgess Shale fossils Prehistoric arthropod genera {{Arthropod-stub Cambrian genus extinctions Hymenocarina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perspicaris
''Perspicaris'' (from the Latin ''perspicax'', meaning “sharp-sighted,” and ''caris'', “crab/shrimp”) an extinct genus of bivalved arthropod from the Cambrian period. Fossils have been found in North America, primarily the Burgess Shale of British Columbia, Canada but also possibly the Wheeler Shale, Marjum Formation, Pioche Shale and Bloomington Formation. Two named species are known from the Burgess Shale ''Perspicaris dictynna'' and ''Perspicaris recondita'', which differ in maximum size ( in ''P. recondita'' vs in ''P. dictynna''), as well as proportions of the tail. Both species have a pair of stalked eyes, as well as a pair of large segmented antennae. The tail is forked and spiny. They are thought to have been active swimmers (nektonic). ''Perspicaris'' has been identified as a member of a clade Hymenocarina close to the crown-group of Euarthropoda Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a segmented body, and paired j ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Branchiocaris
''Branchiocaris'' is an extinct genus of Cambrian bivalved arthropod. The type and best known species, ''Branchiocaris pretiosa,'' was described from the Burgess Shale of British Columbia, Canada, in 1929, originally placed in '' Protocaris'', and was placed into its own distinct genus by Briggs in 1976. Several other possible species have been described from Cambrian deposits in China, and it is also possibly known from Cambrian deposits in Utah. ''Branchiocaris pretiosa'' is around in length, with a highly segmented trunk, consisting of at least 44 ring-like segments, terminating in a forked tail telson. At the front of the animal is a pair of short segmented tapered antennules with at least 20 segments, as well as a pair of claw appendages. It was likely an active swimmer, and used the claw appendages to bring food to the mouth. The discovery of '' Tokummia'' from the Burgess Shale, believed to be a close relative of ''Branchiocaris'', has shed light on the evolutionary plac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
