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Conard Fissure
The Conard Fissure is a geologic feature in Northern Arkansas where a deposit of Pleistocene fossils was discovered in 1903. Several specimens from saber-toothed cats were found there among other species. Location The fissure is located near the Buffalo National River in Newton County, Arkansas, approximately 15 miles south of the town of Harrison. It lies approximately one mile north of the river near the border of Newton and Boone County. The fissure is named after Waldo Conard who owned the land that the fissure is situated on. Discovery The original excavation of the Conard Fissure was performed by Barnum Brown who is best known for his discovery of Tyrannosaurus rex. Waldo Conard searched several fissures and crevices on his land in 1903 trying to locate a lead mine that was rumored there. When in April he found bones instead of lead, he forwarded some of the specimens to the American Museum of Natural History (AMNH). As was common at the time, AMNH sent Barnum Brown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleistocene
The Pleistocene ( ; referred to colloquially as the ''ice age, Ice Age'') is the geological epoch (geology), epoch that lasted from to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology. The name is a combination of Ancient Greek () 'most' and (; Latinized as ) 'new'. The aridification and cooling trends of the preceding Neogene were continued in the Pleistocene. The climate was strongly variable depending on the glacial cycle, oscillating between cold Glacial period, glacial periods and warmer Interglacial, int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saber-toothed Cat
Machairodontinae (from Ancient Greek μάχαιρα '' machaira,'' a type of Ancient Greek sword and ὀδόντος ''odontos'' meaning tooth) is an extinct subfamily of carnivoran mammals of the cat family Felidae, representing the earliest diverging major branch of the family. Machairodonts varied in size from comparable to lynxes to exceeding that of lions. The Machairodontinae contain many of the extinct predators commonly known as "saber-toothed cats", including those with greatly elongated upper maxillary canines, such as the famed genus ''Smilodon'' and '' Megantereon,'' though the degree of elongation was variable, and in some machairodontines like '' Dinofelis'' the length of the upper canines was much more modest. Sometimes, other carnivorous mammals with elongated teeth are also called saber-toothed cats, although they do not belong to the felids. Besides the machairodonts, other saber-toothed predators also arose in the nimravids, barbourofelids, machaeroidine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buffalo National River
The Buffalo National River, in Northern Arkansas, was the first National River to be designated in the United States. The Buffalo River is long. The lower flow within the boundaries of an area managed by the National Park Service, where the stream is designated the Buffalo National River. The river flows through Newton, Searcy, Marion, and Baxter Counties, from west to east. The river originates in the highest part of the Boston Mountains of the Ozarks, flows out onto the Springfield Plateau near the historic community of Erbie, and finally crosses a portion of the Salem Plateau just before joining the White River. The Park is home to the state's only elk herd. The upper section of the river in the Ozark National Forest is managed by the U.S. Forest Service and is designated as a National Scenic River and a National Wild River. History The Buffalo National River was established by an Act of Congress on March 1, 1972, ending the recurring plans of the U.S. Army Corp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newton County, Arkansas
Newton County is a County (United States), county in the U.S. state of Arkansas. As of the 2020 United States census, 2020 census, the population was 7,225. The county seat is Jasper, Arkansas, Jasper. Newton County is Arkansas's 46th county, formed on December 14, 1842, and named for Thomas Willoughby Newton, Thomas W. Newton, an Arkansas United States House of Representatives, Congressman. Newton County is part of the Harrison, Arkansas, Harrison, AR Harrison micropolitan area, Micropolitan Statistical Area. It is an alcohol prohibition or dry county. History Newton County residents were divided during the Civil War, serving in both the Confederate and Union armies. John Cecil, who had served as Newton County's sheriff, served as a Confederate Captain. Jasper blacksmith James R. Vanderpool (ca. 1832–1880) served as Captain of Union Company C, 1st Arkansas Infantry (Union), 1st Regiment Arkansas Infantry Volunteers, while farmer and teacher John McCoy (1820–1903) served ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barnum Brown
Barnum Brown (February 12, 1873 – February 5, 1963), commonly referred to as Mr. Bones, was an American paleontologist. He discovered the first documented remains of ''Tyrannosaurus'' during a career that made him one of the most famous fossil hunters working from the late Victorian era into the early 20th century. Family and early life Barnum Brown was born in Carbondale, Kansas on February 12, 1873 to William and Clara Silver Brown. Brown's parents moved to Kansas in 1859, traveling by covered wagon with their daughter, Melissa. Their second daughter, Alice Elizabeth, was born in 1860 in Osage County, Kansas, where the family would build a one-room cabin on top of a coal seam. William made a living in Kansas first by raising corn, hogs, and cattle, but the political turmoil of Bleeding Kansas in the late 1850s and 1860s led to arson and theft of crops and livestock; he supported the family by digging and selling coal, as well as hauling supplies for the government with a fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tyrannosaurus Rex
''Tyrannosaurus'' () is a genus of large theropoda, theropod dinosaur. The type species ''Tyrannosaurus rex'' ( meaning 'king' in Latin), often shortened to ''T. rex'' or colloquially t-rex, is one of the best represented theropods. It lived throughout what is now western North America, on what was then an island continent known as Laramidia. ''Tyrannosaurus'' had a much wider range than other Tyrannosauridae, tyrannosaurids. Fossils are found in a variety of geological formations dating to the latest Campanian-Maastrichtian Age (geology), ages of the late Cretaceous Period (geology), period, 72.7 to 66 mya (unit), million years ago, with isolated specimens possibly indicating an earlier origin in the middle Campanian. It was the last known member of the tyrannosaurids and among the last non-Bird, avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Like other tyrannosaurids, ''Tyrannosaurus'' was a bipedal carnivore with a massive skull balanced ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Museum Of Natural History
The American Museum of Natural History (AMNH) is a natural history museum on the Upper West Side of Manhattan in New York City. Located in Theodore Roosevelt Park, across the street from Central Park, the museum complex comprises 21 interconnected buildings housing 45 permanent exhibition halls, in addition to a planetarium and a library. The museum collections contain about 32 million specimens of plants, animals, fungi, fossils, minerals, rocks, meteorites, human remains, and human cultural artifacts, as well as specialized collections for frozen tissue and genomic and astrophysical data, of which only a small fraction can be displayed at any given time. The museum occupies more than . AMNH has a full-time scientific staff of 225, sponsors over 120 special field expeditions each year, and averages about five million visits annually. The AMNH is a private 501(c)(3) organization. The naturalist Albert S. Bickmore devised the idea for the American Museum of Natural History in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hell Creek, Montana
The Hell Creek Formation is an intensively studied division of mostly Upper Cretaceous and some lower Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation overlies the Fox Hills Formation. The site of Pompeys Pillar National Monument is a small isolated section of the Hell Creek Formation. In 1966, the Hell Creek Fossil Area was designated as a National Natural Landmark by the National Park Service. It is a series of fresh and brackish-water clays, mudstones, and sandstones deposited during the Maastrichtian and Danian (respectively, the end of the Cretaceous period and the beginning of the Paleogene) by fluvial activity in fluctuating river channels and deltas and very occasional peaty swamp deposits along the low-lying eastern continental margin fronting the late Cretaceous Western Interior Seaway. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mylohyus
''Mylohyus'' is an extinct genus of peccary found in North and Central America. It first evolved during the Late Miocene and became extinct at the end of the Pleistocene, around 12,000 years ago, during the Late Pleistocene megafaunal extinction. Six species were known, the most famous being ''Mylohyus nasutus'', also known as the long-nosed peccary. It went extinct at the end of the Rancholabrean North American Land Mammal Age. The genus was slightly larger-bodied than any modern peccaries, with an estimated mass of . Isotope and anatomical studies have suggested that the diet of ''Mylohyus'' varied over geological time, from being primarily a C3 browser during the Blancan, with an increasing consumption of C4 vegetation during the Irvingtonian, with a relatively even mixture of C3 and C4 during the Rancholabrean. Suggestions have been made that it was frugivorous and also consumed hard browse like twigs. ''Mylohyus'' was able to coexist with close phylogenetic relatives ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ozark Mountains
The Ozarks, also known as the Ozark Mountains, Ozark Highlands or Ozark Plateau, is a physiographic region in the U.S. states of Missouri, Arkansas, and Oklahoma, as well as a small area in the southeastern corner of Kansas. The Ozarks cover a significant portion of northern Arkansas and most of the southern half of Missouri, extending from Interstate 40 in Arkansas, Interstate 40 in central Arkansas to Interstate 70 in Missouri, Interstate 70 in central Missouri. There are two mountain ranges in the Ozarks: the Boston Mountains of Arkansas and Oklahoma, as well as the St. Francois Mountains of Missouri. Wahzhazhe Summit (formerly known as Buffalo Lookout), is the highest point in the Ozarks at , and is located in the Boston Mountains, in the westernmost part of Newton County, Arkansas, east of Boston, Arkansas, Boston, Madison County, Arkansas. Geologically, the area is a broad dome (geology), dome with the exposed core in the ancient St. Francois Mountains. The Ozarks cove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ursus Americanus
The American black bear (''Ursus americanus''), or simply black bear, is a species of medium-sized bear which is endemic to North America. It is the continent's smallest and most widely distributed bear species. It is an omnivore, with a diet varying greatly depending on season and location. It typically lives in largely forested areas; it will leave forests in search of food and is sometimes attracted to human communities due to the immediate availability of food. The International Union for Conservation of Nature (IUCN) lists the American black bear as a least-concern species because of its widespread distribution and a large population, estimated to be twice that of all other bear species combined. Along with the brown bear (''Ursus arctos''), it is one of the two modern bear species not considered by the IUCN to be globally threatened with extinction. Taxonomy and evolution The American black bear is not closely related to the brown bear or polar bear, though all three ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smilodon
''Smilodon'' is an extinct genus of Felidae, felids. It is one of the best known saber-toothed predators and prehistoric mammals. Although commonly known as the saber-toothed tiger, it was not closely related to the tiger or other modern cats, belonging to the extinct subfamily Machairodontinae, with an estimated date of Speciation, divergence from the ancestor of living cats around 20 million years ago. ''Smilodon'' was one of the last surviving machairodonts alongside ''Homotherium''. ''Smilodon'' lived in the Americas during the Pleistocene to early Holocene epoch (2.5 Year#mya, mya – at latest 8,200 years ago). The genus was named in 1842 based on fossils from Brazil; the generic name means or combined with . Three species are recognized today: ''S. gracilis'', ''S. fatalis'', and ''S. populator''. The two latter species were probably descended from ''S. gracilis'', which itself probably evolved from ''Megantereon''. The hundreds of specimens obtained from the La Brea T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
