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Polk County, Florida Paleontological Sites
The Polk County paleontological sites are assemblages of Early Miocene to Late Pleistocene vertebrates occurring in Polk County, Florida, United States. Age Era: Neogene Period: Miocene to Pleistocene, ~17.7—1.5 Mya. (calculates to a period of approximately ). Faunal stage: Hemingfordian through early Clarendonian Geological Formation: Bone Valley Formation. Sites Polk County can boast more individual fossil recovery sites than any other Florida county due to the phosphate mining concerns. Bone Valley Formation is a prime geologic formation. Some of these sites are: Agricola Road ( AEO), Agrico Pierce Mine (AEO), American Agricultural Chemical Company Mine, Brewster Phosphate Mine, Fort Meade Mine,Uhen, Mark D., Collection authority and researcher, George Mason University, Assistant Term Professor, Evolution of cetaceans and other marine mammals Kingsford Mine, Phosphoria Mine, Fort Green Mine, Payne Creek Mine, and Palmetto Mine. Coordinates: Specimens Reptiles *''Caretta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polk County Florida Exploding 550px
Polk may refer to: People * James K. Polk, 11th president of the United States * Polk (name), other people with the name Places *Polk (CTA), a train station in Chicago, Illinois *Polk, Illinois, an unincorporated community * Polk, Missouri, an unincorporated community * Polk, Nebraska, a village *Polk, Ohio, a village * Polk, Pennsylvania, a borough *Polk, West Virginia, an unincorporated community *Polk, Wisconsin, a town *Polk City, Florida, a city * Polk City, Iowa, a city * Polk County (other) *Polk Street, San Francisco * Polk Township (other) Historic structures * Polk Home, Columbia, Tennessee, sole surviving residence of U.S. President James K. Polk *Polk Hotel, an historic hotel in Haines City, Florida Military *Camp Polk (Oregon), a former military installation * Fort Polk, a United States Army base in Leesville, Louisiana *Polk (Cyrillic script: полк), Eastern European military division that corresponds to regiment; polk is headed by po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphate
In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthophosphoric acid . The phosphate or orthophosphate ion is derived from phosphoric acid by the removal of three protons . Removal of one or two protons gives the dihydrogen phosphate ion and the hydrogen phosphate ion ion, respectively. These names are also used for salts of those anions, such as ammonium dihydrogen phosphate and trisodium phosphate. File:3-phosphoric-acid-3D-balls.png, Phosphoricacid File:2-dihydrogenphosphate-3D-balls.png, Dihydrogenphosphate File:1-hydrogenphosphate-3D-balls.png, Hydrogenphosphate File:0-phosphate-3D-balls.png, Phosphate In organic chemistry, phosphate or orthophosphate is an organophosphate, an ester of orthophosphoric acid of the form where one or more hydrogen atoms are replaced by organic groups. An example is trimethyl phosphate, . The term also refers to the triv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balaenoptera
''Balaenoptera'' () is a genus of rorquals containing eight extant species. ''Balaenoptera'' comprises all but two of the extant species in its family (the humpback whale and gray whale); the genus is currently polyphyletic, with the two aforementioned species being phylogenetically nested within it. This genus is known in the fossil records from the Neogene to the Quaternary (13.65 million years ago to the present). Taxonomy and systematics The genus ''Balaenoptera'' contains the following extant species and subspecies: * Common minke whale (''Balaenoptera acutorostrata'') ** North Atlantic minke whale (''Balaenoptera acutorostrata acutorostrata'') ** North Pacific minke whale (''Balaenoptera acutorostrata scammoni'') * Antarctic minke whale (''Balaenoptera bonaerensis'') * Sei whale (''Balaenoptera borealis'') ** Northern sei whale (''Balaenoptera borealis borealis'') ** Southern sei whale (''Balaenoptera borealis schlegelii'') * Bryde's whale (''Balaenoptera edeni'') ** ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astrohippus
''Astrohippus'' ("Star horse") is an extinct member of the Equidae tribe Equini, the same tribe that contains the only living equid genus, '' Equus''. Fossil remains have been found in the central United States, Florida, and the Mexican states of Chihuahua, Jalisco, and Guanajuato. The fossils date in time from the oldest dating from the Barstovian in the Miocene to the youngest dating in the Hemphillian faunal stage of the early Pliocene. Based on study of the tooth morphology it is considered unlikely that ''Astrohippus'' could be an ancestor of modern horses, with the most likely ancestor of ''Astrohippus'' being ''Pliohippus''.MacFadden, B. J. (1984). "Astrohippus and Dinohippus". ''J. Vert. Paleon''. 4(2):273–283. The species '' Astrohippus ansae'' was originally described by W. D. Matthew and R. A. Stirton based on several cheek teeth found in the Coffee Ranch quarry, Hemphill County, Texas. This quarry has produced the remains of six other equid genera including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arvicolinae
The Arvicolinae are a subfamily of rodents that includes the voles, lemmings, and muskrats. They are most closely related to the other subfamilies in the Cricetidae (comprising the hamsters and New World rats and mice). Some authorities place the subfamily Arvicolinae in the family Muridae along with all other members of the superfamily Muroidea. Some refer to the subfamily as the Microtinae (yielding the adjective "microtine") or rank the taxon as a full family, the Arvicolidae. The Arvicolinae are the most populous group of Rodentia in the Northern Hemisphere. They often are found in fossil occlusions of bones cached by past predators such as owls and other birds of prey. Fossils of this group are often used for biostratigraphic dating of paleontological and archeological sites in North America and Europe. Description The most convenient distinguishing feature of the Arvicolinae is the nature of their molar teeth, which have prismatic cusps in the shape of alternati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctodus
''Arctodus'' is an extinct genus of short-faced bear that inhabited North America during the Pleistocene (~2.5 Mya until 12,000 years ago). There are two recognized species: the lesser short-faced bear (''Arctodus pristinus'') and the giant short-faced bear (''Arctodus simus''). Both species are relatively rare in the fossil record- ''A. pristinus'' was largely restricted to the Early Pleistocene of the eastern United States, whereas ''A. simus'' had a cosmopolitan range, with most finds being from the Late Pleistocene of the US, Mexico and Canada. ''A. simus'' evolved from ''A. pristinus'', but both species likely overlapped in the Middle Pleistocene. Of these species, ''A. simus'' was larger, is known from more complete remains, and is considered one of the most charismatic of North America's megafauna. Today considered to be an enormous omnivore, ''Arctodus simus'' is believed to be one of the largest known terrestrial mammalian carnivorans that has ever existed. However, ''Arct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aphelops
''Aphelops'' (Greek: "smooth" (apheles), "face" (ops), in a reference of lacking a horn) is an extinct genus of hornless rhinoceros endemic to North America. It lived from the Middle Miocene to the early Pliocene, during which it was a common component of North American mammalian faunas along with ''Teleoceras''. Description On the basis of skull size, the largest species of ''Aphelops'' is ''A. mutilus'' (which is the largest North American rhinoceros) and the smallest is the type species ''A. megalodus''. ''A. mutilus'' has been estimated to have weighed , and ''A. malacorhinus'' has been estimated at . ''Aphelops'' can be distinguished by other members of the Aceratheriinae by two traits: the arched top of the skull, and the long diastema (gap) between the second incisor (lower tusk) and first premolar. Many other aspects of its anatomy are typical of aceratheriines, including: the absence of a horn on the broad, unfused nasal bones; the reduced premaxilla and lost first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agriotherium
''Agriotherium'' is an extinct genus of bears whose fossils are found in Miocene through Pleistocene-aged strata of North America, Europe, Africa, and Asia. This long-lived genus persisted from at least ~11.6–2.5 Mya. Materials from the late-surviving ''A. africanum'' in Africa have suggested that ''A. africanum'' died out during the early Gelasian. Description and diet ''A. africanum'' measured around in body length and weighed up to , making it larger than most living bears; however, mass estimates vary, with further studies presenting a lower mass estimate of . Along with other large bears such as the cave bear, short-faced bears ''Arctodus'' and ''Arctotherium'', and an extinct subspecies of the modern polar bear '' Ursus maritimus tyrannus'', ''Agriotherium'' was among the largest known terrestrial members of Carnivora. They had longer legs and shorter faces than other bears, and were more lightly built. Their wide, short jaws could generate enormous bite force. It is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aelurodon
''Aelurodon'' is an extinct canid genus of the subfamily Borophaginae which lived from the Barstovian land mammal age () of the middle Miocene to the late Miocene epoch (). yu ''Aelurodon'' existed for approximately . Description ''Aelurodon'' are a part of a clade of loosely known as "bone-crushing" or "hyena-like" dogs, that apparently descended from the earlier genera '' |
Acritohippus
''Acritohippus'' is an extinct genus of equine Equinae is a subfamily of the family Equidae, which have lived worldwide (except Indonesia and Australia) from the Hemingfordian stage of the Early Miocene (16 million years ago) onwards. They are thought to be a monophyletic grouping.B. J. Ma ... from North America.T. S. Kelly. 1995. New Miocene horses from the Caliente Formation, Cuyama Valley Badlands, California. Contributions in Science, Natural History Museum of Los Angeles County 455:1-33 References Miocene horses Miocene odd-toed ungulates Fossil taxa described in 1995 Miocene mammals of North America Prehistoric placental genera {{horse-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gavialosuchus
''Gavialosuchus'' is an extinct genus of gavialid crocodylian from the early Miocene of Europe. Currently only one species is recognized, as a few other species of ''Gavialosuchus'' have since been reclassified to other genera. Taxonomy The type species, ''G. eggenburgensis'', is known from the early Miocene of Austria. Two other species - ''G. americanus'' and ''G. carolinensis'' - have since been reclassified to other genera. Myrick Jr. (2001) proposed synonymizing ''Gavialosuchus americanus'' with '' Thecachampsa antiqua''. Piras ''et al.'' (2007) advocated transferring both ''G. americanus'' and ''G. carolinensis'' to ''Thecachampsa'' as distinct species of the latter genus, however. Jouve ''et al.'' (2008) retained ''G. americanus'' in ''Gavialosuchus'' and found it to be the sister group of ''G. eggenburgensis'' (''G. carolinensis'' was not discussed). However, Jouve ''et al.'' (2008) didn't test ''Thecachampsa antiqua'' in their phylogenetic analysis. Shan ''et al.'' (200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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