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Sharps Formation
The Sharps Formation is a Formation (geology), geologic formation in South Dakota. It preserves fossils dating back to the Paleogene. The Sharps Formation is the namesake of the community of Sharps Corner, South Dakota. Fossil content Mammals Carnivorans Eulipotyphlans Lagomorphs Metatherians Primates Rodents Ungulates Reptiles Squamates See also * List of fossiliferous stratigraphic units in South Dakota * Paleontology in South Dakota References * Paleogene geology of South Dakota {{Paleogene-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
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 (geology), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Browns Park Formation
The Browns Park Formation is a geologic formation in Colorado. It preserves fossils dating back to the Neogene period. See also * List of fossiliferous stratigraphic units in Colorado This article contains a list of fossil-bearing stratigraphic units in the state of Colorado, U.S. Sites See also * Paleontology in Colorado References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Colorado Colorado Stratigraphi ... * Paleontology in Colorado References * Neogene Colorado {{Neogene-stub ... [...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] |
Enhydrocyon Restoration Head
''Enhydrocyon'' is an extinct genus of bone crushing canid which inhabited North America during the Oligocene and Early Miocene, 30.8—20.4 Ma, existing for approximately . ''Enhydrocyon'' dentition suggests this animal was a hypercarnivore or mesocarnivore. Species of ''Enhydrocyon'' were relatively large, powerfully built carnivores with a short snout and deep jaws reminiscent of a jaguar.David Macdonald. The Velvet Claw: A Natural History of the Carnivores. BBC Books: London; 1992. p83. These features give the skull a shape resembling that of the extant sea otter The sea otter (''Enhydra lutris'') is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean. Adult sea otters typically weigh between , making them the heaviest members of the weasel family, but among the small ... (''Enhydra''), prompting the scientific name. With an estimated weight of about , this was the earliest genus of canid adapted to be specialized predators. Specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Lower Miocene Fauna From South Dakota (1907) Fig
A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey a and single-storey ɑ. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English grammar, " a", and its variant " an", are indefinite articles. History The earliest certain ancestor of "A" is aleph (also written 'aleph), the first letter of the Phoenician alphabet, which consisted entirely of consonants (for that reason, it is also called an abjad to distinguish it fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harrison Formation
The Harrison Formation is a geologic group in South Dakota and Nebraska. It preserves fossils from the Miocene. See also * List of fossiliferous stratigraphic units in South Dakota * Paleontology in South Dakota Paleontology in South Dakota refers to paleontological research occurring within or conducted by people from the U.S. state of South Dakota. South Dakota is an excellent source of fossils as finds have been widespread throughout the state. During ... References * Geology of South Dakota Neogene geology of Nebraska Neogene geology of Wyoming {{Cretaceous-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hesperocyoninae
The extinct Hesperocyoninae are one of three subfamilies found within the canid family. The other two canid subfamilies are the extinct Borophaginae and extant Caninae. Taxonomic history Hesperocyoninae are basal canids that gave rise to the other two canid subfamilies, the Borophaginae and Caninae. This subfamily was endemic to North America, living from the Duchesnean stage of the Late Eocene through to the early Barstovian stage of the Miocene, lasting around 20 million years. It comprises 10 recognized genera and 26 recognized species. Four major lineages can be defined based on shared characteristics: *'' Mesocyon''-'' Enhydrocyon'' clade (includes '' Cynodesmus, Sunkahetanka, Philotrox'') *'' Osbornodon'' clade *''Paraenhydrocyon'' *''Ectopocynus clade'' The genus '' Caedocyon'', which is only known from a single partial cranium that shows some ''Paraenhydrocyon'' affinities, probably represents another independent lineage. '' Hesperocyon'', which lacks the sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cranium
The skull is a bone protective cavity for the brain. The skull is composed of four types of bone i.e., cranial bones, facial bones, ear ossicles and hyoid bone. However two parts are more prominent: the cranium and the mandible. In humans, these two parts are the neurocranium and the viscerocranium (facial skeleton) that includes the mandible as its largest bone. The skull forms the anterior-most portion of the skeleton and is a product of cephalisation—housing the brain, and several sensory structures such as the eyes, ears, nose, and mouth. In humans these sensory structures are part of the facial skeleton. Functions of the skull include protection of the brain, fixing the distance between the eyes to allow stereoscopic vision, and fixing the position of the ears to enable sound localisation of the direction and distance of sounds. In some animals, such as horned ungulates (mammals with hooves), the skull also has a defensive function by providing the mount (on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enhydrocyon
''Enhydrocyon'' is an extinct genus of bone crushing canid which inhabited North America during the Oligocene and Early Miocene, 30.8—20.4 Ma, existing for approximately . ''Enhydrocyon'' dentition suggests this animal was a hypercarnivore or mesocarnivore. Species of ''Enhydrocyon'' were relatively large, powerfully built carnivores with a short snout and deep jaws reminiscent of a jaguar.David Macdonald. The Velvet Claw: A Natural History of the Carnivores. BBC Books: London; 1992. p83. These features give the skull a shape resembling that of the extant sea otter The sea otter (''Enhydra lutris'') is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean. Adult sea otters typically weigh between , making them the heaviest members of the weasel family, but among the sma ... (''Enhydra''), prompting the scientific name. With an estimated weight of about , this was the earliest genus of canid adapted to be specialized predators. Species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hoplophoneus
''Hoplophoneus'' (Greek: "murder" (phonos), "weapon" (hoplo)) is an extinct genus of the family Nimravidae, endemic to North America during the Late Eocene to Early Oligocene epochs (35–29 mya), existing for approximately . Taxonomy In 2016, all North American species of '' Eusmilus'' were placed in ''Hoplophoneus'' by Paul Z. Barrett. Description ''Hoplophoneus'', though not a true cat, was similar to cats in outward appearance, though with a robust body and shorter legs. The largest known specimen was examined by Sorkin (2008) for body mass and was estimated to have a weight of . ''Hoplophoneus occidentalis'' was about the size of a large leopard The leopard (''Panthera pardus'') is one of the five extant species in the genus '' Panthera'', a member of the cat family, Felidae. It occurs in a wide range in sub-Saharan Africa, in some parts of Western and Central Asia, Southern Russia, a ... and had canine teeth of only moderately-larger size. The larger ''H. si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Junior Synonym
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linnaeus was the first to give a scientific name (under the currently used system of scientific nomenclature) to the Norway spruce, which he called ''Pinus abies''. This name is no longer in use, so it is now a synonym of the current scientific name, '' Picea abies''. * In zoology, moving a species from one genus to another results in a different binomen, but the name is considered an alternative combination rather than a synonym. The concept of synonymy in zoology is reserved for two names at the same rank that refers to a taxon at that rank - for example, the name ''Papilio prorsa'' Linnaeus, 1758 is a junior synonym of ''Papilio levana'' Linnaeus, 1758, being names for different seasonal forms of the species now referred to as ''Araschnia le ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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