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Runningwater Formation
The Runningwater Formation is a geologic formation in Nebraska. It preserves fossils dating back to the Hemingfordian of the Early Miocene of the Neogene period. The sandstones and conglomerates of the formation were deposited in a fluvial environment. The formation has provided many fossil mammals. Fossil content Among the following fossils have been found in the formation:Runningwater Formation at .org ;Mammals * '' Aletomeryx gracilis'' * '' [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desmatippus
''Desmatippus'' is an extinct, three-toed, browsing member of the Equidae. It lived in what is now North America during the Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" ... period (about 23 mya to 5 mya). ''Desmatippus'' was 60 cm height and 20 kg in weight. References Miocene odd-toed ungulates Miocene horses Prehistoric placental genera Miocene mammals of North America Fossil taxa described in 1893 {{paleo-oddtoedungulate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anchitheriomys
''Anchitheriomys'' is an extinct member of the beaver family, Castoridae. It inhabited North America and Eurasia during the middle Miocene. The name of the genus comes from ''Anchitherium'', an extinct genus of horses, and the Greek word for mouse, μῦς (''mys''), thus meaning "''Anchitheriums mouse", because the fossils of both genera usually co-occur. Until recently, ''Anchitheriomys'' was placed in a closely related family of rodents, the Eutypomyidae, but a partial skull shows similarities to another early beaver, ''Agnotocastor ''Agnotocastor'' is an extinct member of the beaver family Castoridae. Unlike its modern relative, this species took the place of muskrats in the rivers of North America during the Oligocene The Oligocene ( ) is a geologic epoch of the Pa ...''.* References Prehistoric beavers Prehistoric rodent genera Oligocene rodents Prehistoric mammals of Europe {{paleo-rodent-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osbornodon
''Osbornodon'' (" Osborn's tooth") is an extinct genus of canid that were endemic to North America and which lived from the Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the ... to the Early Miocene, 33.9—15.97 Ma ( AEO), existing for approximately . It was the last surviving genus of the hesperocyonine subfamily, the oldest subfamily of canids. Species Seven known species of ''Osbornodon'' existed: *''Osbornodon bra ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metatomarctus
''Metatomarctus'' is an extinct genus of the Borophaginae subfamily of canids native to North America. It lived during the Early to Middle Miocene, 23—16 Mya, existing for approximately It was an intermediate-size canid, and more predaceous than earlier borophagines. It hunted in packs, like modern canines, and may have preyed upon creatures such as '' Equus'', rodents, and other smaller prey. Fossil distribution *Thomas Farm Site, Gilchrist County, Florida, estimated age ~23.3—16.3 Mya.www.flmnh.ufl.edu *Pollack Farm Site, Kent County, Delaware. *Hackberry Wash, |
Merychyus
''Merychyus'' is an extinct genus of oreodont of the family Merycoidodontidae, endemic to North America. It lived during the Miocene, 20.4—10.3 mya, existing for approximately .''Merychyus'' at .org Fossils are widespread through the central and western United States. ''Merychyus'' was a with a short face, tusk-like , heavy body, long tail, short feet, and [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Menoceras
''Menoceras'' ("Crescent Horns") is a genus of extinct, small rhinoceros endemic to most of southern North America and ranged as far south as Panama during the early Miocene epoch. It lived from around 30.7—19.7 Ma, existing for approximately . Description Male ''Menoceras'' sported two horns side by side at the tip of the nose, whereas the females were hornless. All other rhino genera, save the related genus '' Diceratherium'', have their horns arranged one behind the other. Either gender of ''Menoceros'' grew to a length of long. Paleobiology ''Menoceras'' roamed across a tropical, savanna-like grassland and plains environment that covered much of North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car .... Because of the massive accumulations of fossil bones ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desmocyon
''Desmocyon'' is an extinct genus of the Borophaginae subfamily of canids native to North America. It lived from the Late Oligocene to the Early Miocene, 24.8—16.3 Mya, existing for approximately . It is a rarely found genus, with fossil deposits only occurring in western Nebraska, Wyoming, New Mexico and north Florida. It is regarded as a primitive, transitional member of the Borophagini Borophagini is a clade or tribe of the subfamily Borophaginae. This is an extinct group of terrestrial canids that were endemic and widespread throughout North America and Central America which lived during the Geringian stage of the Oligoce ... tribe. References zipcodezoo.com*''The Biology and Conservation of Wild Canids'' by David W. Macdonald and Claudio Sillero-Zubiri; page 42 Borophagines Miocene canids Pliocene extinctions Prehistoric carnivorans of North America Prehistoric carnivoran genera {{canid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daphoenodon
''Daphoenodon'' is an extinct genus of terrestrial carnivore, which lived in the early Miocene and belonged to the family Amphicyonidae ("bear dogs") of the suborder Caniformia Caniformia is a suborder within the order Carnivora consisting of "dog-like" carnivorans. They include dogs ( wolves, foxes, etc.), bears, raccoons, and mustelids. The Pinnipedia ( seals, walruses and sea lions) are also assigned to this gro .... The species of ''Daphoenodon'' are characterized by limbs that are specialized in fore and aft movement, as well as a body alignment that results in a lengthened stride. Hunt, R.M. (2009). "Long-Legged Pursuit Carnivorans (Amphicyonidae, Daphoeninae) from the Early Miocene of North America". ''Bulletin of the American Museum of Natural History.'' 318: 1-95. Species ''D.'' ''falkenbachi'' was a larger species that was found in northern Goshen, southeastern Platte Counties, Wyoming, and Nebraska. A smaller species, ''D. skinneri'', was found in southern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
