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1987 In Paleontology
Plants Angiosperms Molluscs Newly described bivalves Arthropods Newly described arachnids Newly described crustaceans Newly described insects Vertebrates * Stokes suggested that sauropods recycled their gastroliths and chose them based on brightness of color.Sanders, F.; Manley, K.; & Carpenter, K. 2001. Gastroliths from the Lower Cretaceous sauropod *Cedarosaurus weiskopfae*. pp. 166-180. In: Newly described dinosaurs Newly named birds Pterosaurs New taxa References {{reflist, 30em 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 7 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acer Alaskense
''Acer alaskense'' is an extinct maple species in the family Sapindaceae described from a fossil leaf. The species is solely known from the Latest Paleocene sediments exposed in the Matanuska River Valley, Matanuska-Susitna Borough, Alaska. It is the type species for the extinct section ''Alaskana''. Type locality The species was described from a single full-leaf specimen found in the Chickaloon Formation, which underlies the Kenai Group formations. Sediments of the formation are mainly claystone through sandstone, and conglomerates with interbedded deposits of bituminous coal. Based on the surrounding formations and the floral composition of fossils in the formation itself, the Chickaloon dates to the Paleocene with ''Acer alaskense'' known only from the latest Paleocene section exposed in the Even Jones coal mine. History and classification ''Acer alaskense'' was described from a solitary specimen, the holotype (number "USNM 396009"), which is currently preserved in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Eocene
In the geologic timescale the Ypresian is the oldest age or lowest stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the lower Eocene. Events The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum (PETM). The Fur Formation in Denmark, the Messel shales in Germany, the Oise amber of France and Cambay amber of India are of this age. The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from the Ypresian. Stratigraphic definition The Ypresian Stage was introduced in scientific literature by Belgian geologist André Hubert Dumont in 1850. The Ypresian is named after the Flemish city of Ypres in Belgium (spelled ''Ieper'' in Dutch). The definitions of the original stage were totally different from the modern ones. The Ypresian shares its name with the Belgian Ieper Group (French: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Latah Formation
The Latah Formation is a series of late Miocene lacustrine sedimentary deposits which outcrop in eastern Washington and northwestern Idaho. The lake beds are interbedded with igneous rock of the Columbia River Basalt Group. The formation was originally detailed from a site in Spokane, Washington by Dr. Kirk Bryan in a 1923 talk, and then formally described in a 1926 journal article by Joseph Pardee and Bryan. When first described the formation was thought to have predated the deposition of the Columbia River Basalts, however further investigation showed them to be interbedded, being laid down in successive events. Potassium-argon dating of the formation returned an age range of 21.3 to 12.1 million years old, indicating an Early to Middle Miocene age range. Numerous fossil plants and insects have been recovered from the formation and described. The Latah Formation includes the Clarkia fossil beds The Clarkia fossil beds (also known locally as the Fossil Bowl) is a Miocene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Miocene
The Late Miocene (also known as Upper Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages. The Tortonian and Messinian stages comprise the Late Miocene sub-epoch, which lasted from 11.63 Ma (million years ago) to 5.333 Ma. The evolution of life The gibbons (family Hylobatidae) and orangutans (genus ''Pongo'') are the first groups to split from the line leading to the hominins, including humans, then gorillas (genus ''Gorilla''), and finally, chimpanzees and bonobos (genus ''Pan (genus), Pan''). The splitting date between hominin and chimpanzee lineages is placed by some between 4 to 8 million years ago, that is, during the Late Miocene. References External links GeoWhen Database - Late Miocene Miocene, .03 Miocene geochronology, 03 Messinian, * Tortonian, * {{geochronology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acer Latahense
''Acer latahense'' is an extinct maple species in the family Sapindaceae described from series of isolated fossil leaves. The species is known from the latest early to middle Miocene sediments exposed in the states of Oregon and Washington, USA. It is one of several extinct species placed in the living section '' Macrantha''. History and classification ''Acer latahense'' is represented by a group of fossil specimens from three different geologic formations. Three of the leaves were recovered from the early Miocene to late Miocene aged outcrops of the Latah Formation near Spokane in Washington state. Another leaf is from the similarly aged Mascall formation near Tipton, Oregon, while the last fossil is from the middle Miocene age Succor Creek Formation near Nyssa, Oregon. Both the Latah and Mascall Formations are composed of temporary lake beds which are interbedded with lava flows belonging to the Columbia River Basalt Group. While the very similar floral composition of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tyonek Formation
The Tyonek Formation is a geologic formation in Alaska. It preserves fossils dating back to the Neogene period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Neogene Alaska {{Neogene-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acer Kenaicum
''Acer kenaicum'' is an extinct maple species in the family Sapindaceae described from a pair of fossil leaves and a samara. The species is known solely from the Oligocene sediments found exposed in central coastal Alaska, US. It is one of several extinct species belonging to the living section '' Rubra''. Taxonomy ''Acer kenaicum'' is known from a pair of leaf specimens and a solitary samara which were recovered from two different outcrops of Early Oligocene strata. The Redoubt Point Flora is part of the Tyonek Formation, while the Tsadaka Canyon belongs to the Tsadaka Formation. While hundreds of fossil leaves were examined from the Redoubt Point flora, only one ''A. kenaicum'' leaf and one samara fossil was identified. In the Tsadaka Canyon flora a single ''A. kenaicum'' leaf was found. An additional leaf fragment, which was to fragmentary to describe to species, but showing morphology seen in the modern ''Acer'' section ''Spicata'' species. The type specimens for ''A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acer Ivanofense
''Acer ivanofense'' is an extinct maple species in the family Sapindaceae described from series of isolated fossil leaves. The species was described from Eocene to Oligocene aged fossils found in the United States of America. It is one of several extinct species placed in the living section '' Glabra''. History and classification ''Acer ivanofense'' is represented by a group of fossil specimens recovered from late Eocene to early Oligocene outcrops of the lower Meshik Volcanics, formerly called the Meshik Formation, at US Geological Survey site 11418 on Road Island, Ivanof Bay on the Alaska Peninsula. The rocks were first named in 1929 by R.S. Knappen for material exposed along the Meshik River near Meshik Lake. In 1996 the sequence was reexamined and subsequently renamed the Meshick Volcanics by Robert L. Detterman and a group of researchers, to better reflect the lithology of the rocks. The age of the formation is considered to range from approximately to approximately . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Klondike Mountain Formation
The Klondike Mountain Formation is an Early Eocene (Ypresian) geological formation located in the northeast central area of Washington state. The formation, named for the type location designated in 1962, Klondike Mountain north of Republic, Washington, is composed of volcanic rocks in the upper unit and volcanics plus lacustrine (lakebed) sedimentation in which a lagerstätte with exceptionally well-preserved plant and insect fossils has been found, along with fossil epithermal hot springs. The formation is the youngest in a group of formations which belong to the Challis Sequence rocks. The formation unconformably overlies rocks of the Eocene Sanpoil Volcanics and much older Triassic and Permian formations. The formation is bounded on its edges by a series of high-angle strike slip faults, which have contained the Klondike Mountain Formation in a series of graben structures, such as the Republic Graben. Public access to a fossiliferous outcrop at the north end of Republic is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ypresian
In the geologic timescale the Ypresian is the oldest age (geology), age or lowest stage (stratigraphy), stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the lower Eocene. Events The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum (PETM). The Fur Formation in Denmark, the Messel shales in Germany, the Oise amber of France and Cambay amber of India are of this age. The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from the Ypresian. Stratigraphic definition The Ypresian Stage was introduced in scientific literature by Belgium, Belgian geologist André Hubert Dumont in 1850. The Ypresian is named after the Flanders, Flemish city of Ypres in Belgium (spelled ''Ieper'' in Dutch). The definitions of the original stage were totally different from the modern ones. The Ypresi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acer Hillsi
''Acer hillsi'' is an extinct maple species in the family Sapindaceae described from a single fossil samara. The species is solely known from the Early Eocene sediments exposed in northeast Washington state, United States and the adjacent area of south central British Columbia, Canada. It is one of only two species belonging to the extinct section '' Stewarta''. Taxonomy ''Acer hillsi'' is known from a single specimen which was recovered from the Burke Museum of Natural History and Culture location UWBM A0307, an outcrop of the early Eocene, Ypresian Klondike Mountain Formation in Republic. The UWBM A0307 site is known as the "Corner lot" locality. The section ''Stewarta'' is known only from ''A. hillsi'' and the related species '' A. stewarti'' described from the Ypresian Allenby Formation exposed near Princeton, British Columbia. Both the Allenby and Klondike Mountain Formations preserve upland temperate floras which were first interpreted as being microthermal, however furt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
