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Agate Fossil Beds
Agate Fossil Beds National Monument is a U.S. National Monument near Harrison, Nebraska. The main features of the monument are a valley of the Niobrara River and the fossils found on Carnegie Hill and University Hill. The area largely consists of grass-covered plains. Plants on the site include prairie sandreed, blue grama, little bluestem and needle and thread grass, and the wildflowers lupin, spiderwort, western wallflower and sunflowers. History Originally the Agate Springs Ranch, a working cattle ranch, was owned by Capt. James Cook. The monument's museum collection also contains more than 500 artifacts from the Cook Collection of Plains Indians artifacts. The national monument was authorized on June 5, 1965, but was not established until June 14, 1997. The Harold J. Cook Homestead (Bone Cabin Complex) was listed on the National Register of Historic Places in 1977. Agate Fossil Beds is maintained by the National Park Service. Paleontology The site is best known for a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sioux County, Nebraska
Sioux County is a County (United States), county in the U.S. state of Nebraska. As of the 2010 United States Census, the population was 1,311. Its county seat is Harrison, Nebraska, Harrison. Sioux County is included in the Scottsbluff, Nebraska, Scottsbluff, NE Scottsbluff Micropolitan Statistical Area, Micropolitan Statistical Area. In the Vehicle registration plates of Nebraska, Nebraska license plate system, Sioux County is represented by the prefix 80 (it had the 80th-largest number of vehicles registered in the state when the license plate system was established in 1922). Geography Sioux County lies at the NW corner of Nebraska. Its north boundary line abuts the south line of the state of South Dakota and its west boundary line abuts the east boundary line of the state of Wyoming. The Niobrara River flows southeastward and eastward through the upper central part of the county. The county terrain is arid low rolling hills, sloping to the east and southeast. The terrain is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plains Indians
Plains Indians or Indigenous peoples of the Great Plains and Canadian Prairies are the Native American tribes and First Nation band governments who have historically lived on the Interior Plains (the Great Plains and Canadian Prairies) of North America. While hunting-farming cultures have lived on the Great Plains for centuries prior to European contact, the region is known for the horse cultures that flourished from the 17th century through the late 19th century. Their historic nomadism and armed resistance to domination by the government and military forces of Canada and the United States have made the Plains Indian culture groups an archetype in literature and art for Native Americans everywhere. The Plains tribes are usually divided into two broad classifications which overlap to some degree. The first group became a fully nomadic horse culture during the 18th and 19th centuries, following the vast herds of American bison, although some tribes occasionally engaged in ag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diceratherium
''Diceratherium'' (meaning "two horned beast") is an extinct genus of rhinoceros endemic to North America, Europe, and Asia during the Oligocene through Miocene living from 33.9 to 11.6 mya, existing for approximately . Mass estimates for the type species, ''D. armatum'' average around Taxonomy ''Diceratherium'' was named by Marsh (1875). It is not extant. Its type is ''Diceratherium armatum''. It was assigned to Rhinocerotidae by Marsh (1875) and Carroll (1988); to Diceratheriinae by Prothero (1998); to Aceratheriinae by Weidmann and Ginsburg (1999); and to Teleoceratini by Sach and Heizmann (2001).V. J. Sach and E. P. J. Heizmann. 2001. Stratigraphy and mammal faunas of the Brackwassermolasse in the surroundings of Ulm (Southwest Germany). Stuttgarter Beiträge zur Naturkunde, Serie B (Geologie und Paläontologie) 310:1-95 ''Diceratherium'' had two horns side by side on its nose. It lived during the Miocene Epoch The Miocene ( ) is the first geological epoch of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolution Of The Horse
The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, forest-dwelling '' Eohippus'' into the modern horse. Paleozoologists have been able to piece together a more complete outline of the evolutionary lineage of the modern horse than of any other animal. Much of this evolution took place in North America, where horses originated but became extinct about 10,000 years ago. The horse belongs to the order Perissodactyla (odd-toed ungulates), the members of which all share hooved feet and an odd number of toes on each foot, as well as mobile upper lips and a similar tooth structure. This means that horses share a common ancestry with tapirs and rhinoceroses. The perissodactyls arose in the late Paleocene, less than 10 million years after the Cretaceous–Paleogene extinction event. This group of animals appears to have been originally specialized for life in tropical forests, but wherea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parahippus
''Parahippus'' ("near to horse"), is an extinct equid, a relative of modern horses, asses and zebras. It lived from 24 to 17 million years ago, during the Miocene epoch. It was very similar to ''Miohippus'', but slightly larger, at around tall, at the withers. Their fossils have been found in North America, primarily in the Great Plains region and Florida. Description ''Parahippus'' was larger than ''Miohippus'', with longer legs and face. The bones in the legs were fused and this, along with muscle development, allowed ''Parahippus'' to move with forward-and-back strides. Flexible leg rotation was eliminated, so that the animal was better adapted to fast forward running on open ground without moving from side to side. Most importantly, ''Parahippus'' was able to stand on its middle toe, instead of walking on pads, which gave it the ability to run faster; its weight was supported by ligaments under the fetlock to the big central toe. Since leafy food had become scarce, thes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Merychippus
''Merychippus'' is an extinct proto-horse of the family Equidae that was endemic to North America during the Miocene, 15.97–5.33 million years ago. It had three toes on each foot and is the first horse known to have grazed. Discovery and naming ''Merychippus'' was named by Joseph Leidy (1856). Numerous authors assigned the type species – ''Merychippus insignis'' – to ''Protohippus'', but this is ignored. It was assigned to the Equidae by Leidy (1856) and Carroll (1988), and to the Equinae by MacFadden (1998) and Bravo-Cuevas and Ferrusquía-Villafranca (2006). Its name means "ruminant horse", but current evidence does not support ''Merychippus'' ruminating. Description ''Merychippus'' lived in groups. It was about tall and at the time it was the tallest equine to have existed. Its muzzle was longer, deeper jaw, and eyes wider apart than any other horse-like animal to date. The brain was also much larger, making it smarter and more agile. ''Merychippus'' was the first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miohippus
''Miohippus'' (meaning "small horse") was a genus of prehistoric horse existing longer than most Equidae. ''Miohippus'' lived in what is now North America from 32 to 25 million years ago, during the late Eocene to late Oligocene. ''Miohippus'' was a horse of the Oligocene. According to the Florida Museum of Natural History, Othniel Charles Marsh first believed ''Miohippus'' lived during the Miocene and thus named the genus using this incorrect conclusion. More recent research provides evidence that ''Miohippus'' actually lived during the Paleogene period. ''Miohippus'' species are commonly referred to as the three-toed horses. Their range was from Alberta, Canada to Florida to California. Taxonomy The type species of ''Miohippus'', ''M. annectens'', was named by Marsh in 1874. It is classified as a member of the subfamily Anchitheriinae following MacFadden (1998).B. J. MacFadden. 1998. Equidae. In C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammal
Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or hair, and three middle ear bones. These characteristics distinguish them from reptiles (including birds) from which they diverged in the Carboniferous, over 300 million years ago. Around 6,400 extant species of mammals have been described divided into 29 orders. The largest orders, in terms of number of species, are the rodents, bats, and Eulipotyphla (hedgehogs, moles, shrews, and others). The next three are the Primates (including humans, apes, monkeys, and others), the Artiodactyla ( cetaceans and even-toed ungulates), and the Carnivora (cats, dogs, seals, and others). In terms of cladistics, which reflects evolutionary history, mammals are the only living members of the Synapsida (synapsids); this clade, together with Saur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American Land Mammal Age
The North American land mammal ages (NALMA) establishes a geologic timescale for North American fauna beginning during the Late Cretaceous and continuing through to the present. These periods are referred to as ages or intervals (or stages when referring to the rock strata of that age) and were established using geographic place names where fossil materials were obtained. System The North American land-mammal-age system was formalized in 1941 as a series of provincial land-mammal ages. The system was the standard for correlations in the terrestrial Cenozoic record of North America and was the source for similar time scales dealing with other continents. The system was revised into a formal chronostratigraphic system. This approach is nominally justified by international stratigraphic codes; it holds that first appearances of individual species in particular sections are the only valid basis for naming and defining the land-mammal ages. The basic unit of measure is the first/last bo ... [...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] |
Anderson Ranch Formation
Anderson or Andersson may refer to: Companies * Anderson (Carriage), a company that manufactured automobiles from 1907 to 1910 * Anderson Electric, an early 20th-century electric car * Anderson Greenwood, an industrial manufacturer * Anderson Racing Karts, a manufacturer of Superkart racing chassis * O.P. Anderson, a brand of aquavit vodka People * Anderson (surname), includes list of people surnamed Anderson * Anderson (given name) * Andersson, a surname * Anderson (footballer, born 1972) * Anderson (footballer, born 1978) * Anderson (footballer, born 1980) * Anderson (footballer, born 1981) (Andrade Santos Silva), defender * Anderson (footballer, born 1982) * Anderson (footballer, born March 1983) * Anderson (footballer, born April 1983) * Anderson (footballer, born November 1983) * Anderson (footballer, born 1985) * Anderson (footballer, born 1988) (Anderson Luís de Abreu Oliveira), midfielder * Anderson (footballer, born 1992) * Anderson (footballer, born 1995) (Anderson de ... [...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] |
