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1952 In Paleontology
Plants Mosses Ferns Conifers Cycads Flowering plants Archosauromorphs Dinosaurs Data courtesy of George Olshevsky's dinosaur genera list. Plesiosaurs New taxa Synapsids Non-mammalian References {{portal, Paleontology 1950s in paleontology Paleontology Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ... Paleontology 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denver Formation
The Denver Formation is a geological formation that is present within the central part of the Denver Basin that underlies the Denver, Colorado, area. It ranges in age from latest Cretaceous (Maastrichtian) to early Paleocene, and includes sediments that were deposited before, during and after the Cretaceous-Paleogene boundary event.Tweto, O. 1979. Geologic map of Colorado. U.S. Geological Survey, Map G77115. The formation is known for its paleontological resources, including dinosaur remains that are found in the Late Cretaceous part of the formation, and it includes aquifers that are important sources of water for the area. Stratigraphy The Denver Formation rests on the Arapahoe Formation, and its base is marked by the first appearance of tuffaceous sediments. It is overlain by the Dawson Arkose. In 2002 the Denver Formation was included as part of a larger unconformity-bounded unit named the D1 sequence, in order to facilitate basin-wide studies and avoid confusion arising ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleocene
The Paleocene, ( ) or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name is a combination of the Ancient Greek ''palaiós'' meaning "old" and the Eocene Epoch (which succeeds the Paleocene), translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg extinction event, brought on by Chicxulub impact, an asteroid impact and possibly volcanism, marked the beginning of the Paleocene and killed off 75% of living species, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene Thermal Maximum (PETM), which was a major climatic event wherein about 2,500–4,500 gigatons of carbon were released into the atmosphere and ocean systems, causing a spike in global temperatures and ocean acidification. In the Pal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frank Knowlton
Frank Hall Knowlton (September 2, 1860 - November 22, 1926) was an American botanist, ornithologist and naturalist. Born in Vermont, he joined the Geological Survey and took an interest in fossil plants in the local lignite, later becoming a specialist in paleobotany. He was born in Brandon, Vermont to a family of old settlers. He went to study at Middlebury College where he took an interest in natural history, influenced by Ezra Brainerd and Henry M. Seely. He received a BS in 1884 and an MS in 1887. He visited the US National Museum in Washington in 1884, while preparing an exhibit for the World Cotton Centennial in New Orleans and came in contact with palaeobotanist Lester F. Ward there. He later became an assistant to Ward on the Geology Survey, during which time he studied fossil wood in the lignites of the Potomac. He joined the Geological Survey as an assistant paleontologist in 1894 and was promoted geologist in 1907. He joined the Columbian College , mottoeng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Athyrium Crossii
''Athyrium'' (lady-fern) is a genus of about 180 species of terrestrial ferns, with a cosmopolitan distribution. It is placed in the family Athyriaceae, in the order Polypodiales. Its genus name is from Greek '' a-'' ('without') and Latinized Greek '' thyreos'' ('shield'), describing its inconspicuous indusium (sorus' covering). The common name "lady fern" refers in particular to the common lady fern, '' Athyrium filix-femina''.Entry "lady fern", ''New Oxford American Dictionary 3rd edition'' (2010) by Oxford University Press, Inc. ''Athyrium'' species are used as food plants by the larvae of some Lepidoptera Lepidoptera ( ) is an order (biology), order of insects that includes butterfly, butterflies and moths (both are called lepidopterans). About 180,000 species of the Lepidoptera are described, in 126 Family (biology), families and 46 Taxonomic r ... species including the small angle shades and '' Sthenopis auratus''. Species There are about 180, including: Referen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhynchostegium Knowltoni
''Rhynchostegium'' is a genus of pleurocarpous mosses belonging to the family Brachytheciaceae. The genus has a cosmopolitan distribution across different climatological regions except the polar regions, mostly in tropic to north temperate regions. The genus contains both aquatic and terrestrial species. The genus was named for their rostrate opercula. The type species of this genus is ''Rhynchostegium confertum'' (Dicks.) Schimp. Etymology The genus name comes from the Greek ''rhyncho-'' (beaked) and ''stegos'' (a lid), which refers to the rostrate operculum of the sporophyte. History The genus was first described by Bruch and Wilhelm Philippe Schimper in 1852. Habitats Terrestrial species of ''Rhynchostegium'' live in moist to wet or shaded habitats, on rock, soil, tree base, tree stem, and logs. Aquatic species live by or in running water, including streams, springs, rivers, beds of waterfalls, and seepy cliffs. Morphology Gametophyte ''Rhynchostegium'' are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roslyn Formation
The Roslyn Formation is a geologic formation in Washington (state). It preserves fossils dating back to the Paleogene period. See also * List of fossiliferous stratigraphic units in Washington (state) This article contains a list of fossil-bearing stratigraphic units in the state of Washington, U.S. Sites See also * Paleontology in Washington (state) References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Washington (state) ... * Paleontology in Washington (state) References * Paleogene geology of Washington (state) {{Paleogene-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
