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Daphoenus
''Daphoenus'' is an extinct genus of bear dogs. ''Daphoenus'' inhabited North America from the Middle Eocene to the Middle Miocene, 37.2—16.0 Mya, existing for approximately . Species ''D. hartshornianus'' fossils found in Oligocene Orellan rocks in the Lower Nodular Zone, Pennington County, South Dakota are dated at ~33.4 Ma. Other sites include the Prairie Dog Creek Site and Warbonnet Creek Site, Sioux County, Nebraska ~33.4 Ma., Bartlett High Site, Dawes County, Nebraska ~33.2 Ma., Babby Butte Site, Oglala Lakota County, South Dakota ~33.4 Ma—33.2 Ma. ''D. lambei'' fossils found in Eocene Duchesnean rocks at the Big Red Horizon Site, Presidio County, Texas are dated at ~38.4—38.3 Ma. Other sites include the Badwater Locality 20 Site and Wood Locality Site, Natrona County, Wyoming ~41.8 Ma., Lac Pelletier Lower Fauna Site, Saskatchewan ~42.3 Ma. ''D. ruber'' fossils were found in Oligocene Arikareean rocks in the Tecuya Canyon Formation of Kern County, California wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphoenus Vetus
''Daphoenus'' is an extinct genus of bear dogs. ''Daphoenus'' inhabited North America from the Middle Eocene to the Middle Miocene, 37.2—16.0 Mya, existing for approximately . Species ''D. hartshornianus'' fossils found in Oligocene Orellan rocks in the Lower Nodular Zone, Pennington County, South Dakota are dated at ~33.4 Ma. Other sites include the Prairie Dog Creek Site and Warbonnet Creek Site, Sioux County, Nebraska ~33.4 Ma., Bartlett High Site, Dawes County, Nebraska ~33.2 Ma., Babby Butte Site, Oglala Lakota County, South Dakota ~33.4 Ma—33.2 Ma. ''D. lambei'' fossils found in Eocene Duchesnean rocks at the Big Red Horizon Site, Presidio County, Texas are dated at ~38.4—38.3 Ma. Other sites include the Badwater Locality 20 Site and Wood Locality Site, Natrona County, Wyoming ~41.8 Ma., Lac Pelletier Lower Fauna Site, Saskatchewan ~42.3 Ma. ''D. ruber'' fossils were found in Oligocene Arikareean rocks in the Tecuya Canyon Formation of Kern County, California with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphoenus Vetus Leidy, 1853
''Daphoenus'' is an extinct genus of bear dogs. ''Daphoenus'' inhabited North America from the Middle Eocene to the Middle Miocene, 37.2—16.0 Mya, existing for approximately . Species ''D. hartshornianus'' fossils found in Oligocene Orellan rocks in the Lower Nodular Zone, Pennington County, South Dakota are dated at ~33.4 Ma. Other sites include the Prairie Dog Creek Site and Warbonnet Creek Site, Sioux County, Nebraska ~33.4 Ma., Bartlett High Site, Dawes County, Nebraska ~33.2 Ma., Babby Butte Site, Oglala Lakota County, South Dakota ~33.4 Ma—33.2 Ma. ''D. lambei'' fossils found in Eocene Duchesnean rocks at the Big Red Horizon Site, Presidio County, Texas are dated at ~38.4—38.3 Ma. Other sites include the Badwater Locality 20 Site and Wood Locality Site, Natrona County, Wyoming ~41.8 Ma., Lac Pelletier Lower Fauna Site, Saskatchewan ~42.3 Ma. ''D. ruber'' fossils were found in Oligocene Arikareean rocks in the Tecuya Canyon Formation of Kern County, California with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphoenus Vetus Head
''Daphoenus'' is an extinct genus of bear dogs. ''Daphoenus'' inhabited North America from the Middle Eocene to the Middle Miocene, 37.2—16.0 Mya, existing for approximately . Species ''D. hartshornianus'' fossils found in Oligocene Orellan rocks in the Lower Nodular Zone, Pennington County, South Dakota are dated at ~33.4 Ma. Other sites include the Prairie Dog Creek Site and Warbonnet Creek Site, Sioux County, Nebraska ~33.4 Ma., Bartlett High Site, Dawes County, Nebraska ~33.2 Ma., Babby Butte Site, Oglala Lakota County, South Dakota ~33.4 Ma—33.2 Ma. ''D. lambei'' fossils found in Eocene Duchesnean rocks at the Big Red Horizon Site, Presidio County, Texas are dated at ~38.4—38.3 Ma. Other sites include the Badwater Locality 20 Site and Wood Locality Site, Natrona County, Wyoming ~41.8 Ma., Lac Pelletier Lower Fauna Site, Saskatchewan ~42.3 Ma. ''D. ruber'' fossils were found in Oligocene Arikareean rocks in the Tecuya Canyon Formation of Kern County, California with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bear Dog
Amphicyonidae is an extinct family of terrestrial carnivorans belonging to the suborder Caniformia. They first appeared in North America in the middle Eocene (around 45 mya), spread to Europe by the late Eocene (35 mya), and appear in Asia, and Africa by the early Miocene (23 mya). They had largely disappeared worldwide by the late Miocene (8 mya), with the latest recorded species at the end of the Miocene in Pakistan. They were among the first carnivorans to evolve large body size. Later in their history, they came into competition with hesperocyonine and borophagine canids. As dogs evolved similar body sizes and cranial and dental adaptations, the rise of these groups may have led to their extinction. Amphicyonids are often colloquially referred to as "bear-dogs". Taxonomy The family was erected by Haeckel (1886) lso attributed to Trouessart (1885) Their exact position has long been disputed. Some early paleontologists defined them as members of the family Canidae, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Eocene
The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods, the strata that define the start and end of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arikareean
The Arikareean North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 30,600,000 to 20,800,000 years BP, a period of . It is usually considered to overlap the Oligocene and Miocene epochs. The Arikareean is preceded by the Whitneyan and followed by the Hemingfordian NALMA stages. The Arikareean can be further divided into the substages of: *late Late Arikareean: Lower boundary source, base of Geringian The Geringian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 30,800,000 to 26,300,000 years BP, a period of . It is usual ... (approximate) *early Late Arikareean: base of Geringian (approximate). Upper boundary source: base of Hemingfordian (approximate). *late Early Arikareean: Lower boundary source of base of Geringian (approximate). Upper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Northwest
The Pacific Northwest (sometimes Cascadia, or simply abbreviated as PNW) is a geographic region in western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Though no official boundary exists, the most common conception includes the U.S. states of Oregon, Washington (state), Washington, and Idaho, and the Canadian province of British Columbia. Some broader conceptions reach north into Alaska and Yukon, south into northern California, and east into western Montana. Other conceptions may be limited to the coastal areas west of the Cascade Mountains, Cascade and Coast Mountains, Coast mountains. The variety of definitions can be attributed to partially overlapping commonalities of the region's history, culture, geography, society, ecosystems, and other factors. The Northwest Coast is the coastal region of the Pacific Northwest, and the Northwest Plateau (also commonly known as "British Columbia Interi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Plains
The Great Plains (french: Grandes Plaines), sometimes simply "the Plains", is a broad expanse of flatland in North America. It is located west of the Mississippi River and east of the Rocky Mountains, much of it covered in prairie, steppe, and grassland. It is the southern and main part of the Interior Plains, which also include the tallgrass prairie between the Great Lakes and Appalachian Plateau, and the Taiga Plains and Boreal Plains ecozones in Northern Canada. The term Western Plains is used to describe the ecoregion of the Great Plains, or alternatively the western portion of the Great Plains. The Great Plains lies across both Central United States and Western Canada, encompassing: * The entirety of the U.S. states of Kansas, Nebraska, North Dakota and South Dakota; * Parts of the U.S. states of Colorado, Iowa, Minnesota, Missouri, Montana, New Mexico, Oklahoma, Texas and Wyoming; * The southern portions of the Canadian provinces of Alberta, Saskatchewan and Manitoba. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plantigrade
151px, Portion of a human skeleton, showing plantigrade habit In terrestrial animals, plantigrade locomotion means walking with the toes and metatarsals flat on the ground. It is one of three forms of locomotion adopted by terrestrial mammals. The other options are digitigrade, walking on the toes with the heel and wrist permanently raised, and unguligrade, walking on the nail or nails of the toes (the hoof) with the heel/wrist and the digits permanently raised. The leg of a plantigrade mammal includes the bones of the upper leg (femur/humerus) and lower leg (tibia and fibula/radius and ulna). The leg of a digitigrade mammal also includes the metatarsals/metacarpals, the bones that in a human compose the arch of the foot and the palm of the hand. The leg of an unguligrade mammal also includes the phalanges, the finger and toe bones. Among extinct animals, most early mammals such as pantodonts were plantigrade. A plantigrade foot is the primitive condition for mammals; digit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leptomeryx
''Leptomeryx'' is an extinct genus of ruminant of the family Leptomerycidae, endemic to North America during the Eocene through Oligocene 38–24.8 Mya, existing for approximately . It was a small deer-like ruminant with somewhat slender body. Fossil distribution Sites and species recovered: *Titus Canyon, Inyo County, California ''(L.blacki)'' ~30.6—33.9 Ma. *UNSM Sx-8 (Orella C), Sioux County, Nebraska ''(L. elissae)'' ~33.9—24.8 Ma. *Anxiety Butte, Saskatchewan, Canada ''(L. sp., L. evansi)'' ~38—24.8 Ma. *Calf Creek, Saskatchewan, Canada, ''(L. mammifer)'' ~38—33.3 Ma. *Toadstool Park, Sioux County, Nebraska ''(L. speciosus)'' ~37.2—33.3 Ma. *Medicine Pole Hills, Bowman County, North Dakota Bowman County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 2,993. Its county seat is Bowman. History The legislature of the Dakota Territory designated Bowman (named for Edward M. Bowman, a member o ... ''(L. yoderi)'' ~38†... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hypertragulus
''Hypertragulus'' is an extinct genus of hypertragulid ruminant endemic to North America. It lived from the Late Eocene to the Middle Miocene, living , existing for approximately . ''Hypertragulus'' were primitive and ancient ruminants, resembling small deer or musk deer, although they were more closely related to modern chevrotains. Its diet is stated to be that of a frugivore. Species *''H. calcaratus'' *''H. chadronensis'' *''H. crawfordensis'' *''H. dakotensis'' *''H. heikeni'' *''H. hesperius'' *''H. minor'' *''H. minutus'' *''H. planiceps'' *''H. quadratus'' *''H. sequens'' Fossil distribution A partial list of fossil sites: * Chihuahua, Mexico * Cedar Creek Formation (Lower & Middle), Logan County, Colorado * Fort Logan Formation, Meagher County, Montana * Upper Pomerado Conglomerate Formation, San Diego County, California *Turtle Cove Member of the John Day Formation, Grant County, Oregon Grant County is one of the 36 counties in the U.S. state of Oregon. As o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hesperocyon
''Hesperocyon'' is an extinct genus of canids (subfamily Hesperocyoninae, family Canidae) that was endemic to North America, ranging from southern Canada to Colorado. It appeared during the Uintan age, – Bridgerian age (NALMA) of the Mid-Eocene– 42.5 Ma to 31.0 Ma. ( AEO). ''Hesperocyon'' existed for approximately . Taxonomy ''Hesperocyon'' was assigned to Borophagini by Wang et al. in 1999 and was the earliest of the canids to evolve after the Caniformia-Feliformia split some 42 million years ago. Fossil evidence dates ''Hesperocyon gregarius'' to at least 37 mya, but the oldest ''Hesperocyon'' has been dated at 39.74 mya from the Duchesnean North American land mammal age. The Canidae subfamily Hesperocyoninae probably arose out of ''Hesperocyon'' to become the first of the three great dogs groups: Hesperocyoninae (~40–30 Ma), Borophaginae (~36–2 Ma), and the Caninae lineage that led to the present-day canids (including grey wolves, foxes, coyotes, jackals and dogs). A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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