Browsing by Author "Skinner, Morris F."
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Item Cenozoic rocks and faunas of Turtle Butte, south-central South Dakota. Bulletin of the AMNH ; v. 138, article 7(New York : [American Museum of Natural History], 1968) Skinner, Morris F.; Skinner, Shirley M.; Gooris, Raymond J.Item Early Pleistocene pre-glacial and glacial rocks and faunas of north-central Nebraska. Bulletin of the AMNH ; v. 148, article 1(New York : [American Museum of Natural History], 1972) Skinner, Morris F.; Hibbard, Claude William, 1905-1973.; Gutentag, Edwin D., 1931-; Smith, G. R.; Lundberg, John G.; Holman, J. Alan.; Feduccia, Alan.; Rich, Pat Vickers."A study of the early Pleistocene rocks of the non-glaciated region of north-central Nebraska shows that a paleovalley fill (Keim Formation, new name) that contained the Sand Draw local fauna was preglacial. The stratigraphic position of the overlying Long Pine Formation, new name, is significant because it is the first evidence of a fluvioglacial outwash in the area. Two later sets of deposits overlie the Long Pine formation: Duffy and Pettijohn formations, new names. The source of the gravel in the Long Pine Formation has been a matter of conjecture, some geologists believing it to be the Black Hills, and others the Rocky Mountains. Supporting evidence for either provenience is lacking. Devonian fossils in the Long Pine Gravel indicate that the source was to the north-northeast near Lake Winnepegosis in Manitoba. The Sand Draw local fauna, previously considered Nebraskan (first continental glacier) or Aftonian (first interstadial), correlates with other Blancan faunas, and is the most diverse and northern known of Blancan time. The following groups comprise the fauna: 42 taxa of molluscs, 14 taxa of ostracodes, 10 taxa of fishes (Chaenobryttus serratus, new species), four taxa of amphibians, 14 taxa of reptiles (Geochelone oelrichi, new species), at least 10 taxa of birds, and 35 taxa of mammals. The mammalian fauna has these new forms: a shrew, Planisorex dixonensis, new genus; four rodents, Spermophilus boothi, new species; Spermophilus meltoni, new species; Ophiomys magilli, new species; Ophiomys fricki, new species; and a mustelid, Buisnictis burrowsi, new species. Some of these fossils indicate that the early Pleistocene climate was warmer than the present one, sub-humid, with evapo-transpiration about equal to average annual precipitation. Presence of the large land tortoise, Geochelone, is evidence that the temperature seldom, if ever, dropped below 0°C. Pollen from the Keim Formation is definaitely not of glacial type"--P. 11.Item The fauna of Papago Springs Cave, Arizona ; and, A study of Stockoceros ; with, Three new antilocaprines from Nebraska and Arizona. Bulletin of the AMNH ; v. 80, article 6.(New York : The American Museum of Natural History, 1942) Skinner, Morris F.Item The fossil bison of Alaska and preliminary revision of the genus. Bulletin of the AMNH ; v. 89, article 3(New York : [American Museum of Natural History], 1947) Skinner, Morris F.; Kaisen, Ove C.Item A North American Oligocene pangolin and other additions to the Pholidota. Bulletin of the AMNH ; v. 142, article 6(New York : [American Museum of Natural History], 1970) Emry, Robert J.; Skinner, Morris F.; American Museum of Natural History. Frick Laboratories.Item A note on Toxotherium (Mammalia, Rhinocerotoidea) from Natrona County, Wyoming. American Museum novitates ; no. 2261(New York, N.Y. : American Museum of Natural History, 1966) Skinner, Shirley M.; Gooris, Raymond J.; Skinner, Morris F.; Galusha, Ted.Item A Pliocene chalicothere from Nebraska, and the distribution of chalicotheres in the late Tertiary of North America. American Museum novitates ; no. 2346(New York, N.Y. : American Museum of Natural History, 1968) Skinner, Morris F.Item A revision of the geology and paleontology of the Bijou Hills, South Dakota. American Museum novitates ; no. 2300(New York, N.Y. : American Museum of Natural History, 1967) Skinner, Morris F.; Taylor, Beryl E.; Gidley, James Williams, 1866-1931.; Matthew, William Diller, 1871-1930.Item Stratigraphy and biostratigraphy of late Cenozoic deposits in central Sioux County, western Nebraska. Bulletin of the AMNH ; v. 158, article 5(New York : American Museum of Natural History, 1977) Skinner, Morris F.; Skinner, Shirley M.; Gooris, Raymond J."The objectives of the present report are (1) to interpret in detail the geology of the Sheep Creek-Snake Creek beds of Sioux County, northwestern Nebraska, which have produced more than 30,000 vertebrate fossil specimens, and (2) to supply precise data for these fossils so that future research will conform to historical data and field observations. An erosional remnant of former high plains, which contains the historic Sheep Creek-Snake Creek beds, has preserved a record of geologic history from early through late Miocene time. A remnant of paleovalley that once contained the streams of the early Miocene Sheep Creek (late Hemingfordian) and the late Miocene Snake Creek formations can be seen in the northwest part of the area. The early Medial Miocene (early Barstovian) Olcott Formation (New), the former Lower Snake Creek beds of Matthew, 1924a, crops out in the classic Sinclair Draw and Olcott Hill area that was explored in the early 1900s. The revised and restricted Snake Creek Formation is divided into three new members: the Medial Miocene Murphy Member (early Clarendonian) on Olcott Hill and in East Pliohippus Draw, the Medial Miocene Laucomer Member (late Clarendonian) on Olcott Hill, and the late Miocene Johnson Member that carries early and late Hemphillian faunas. The present report also deals with the documentary data of early collectors whose numerous synonymous names for some of the 57 quarries has led to the dissipation of faunas"--P. 271.Item Tertiary stratigraphy and the Frick Collection of fossil vertebrates from north-central Nebraska. Bulletin of the AMNH ; v. 178, article 3([New York] : American Museum of Natural History, 1984) Skinner, Morris F.; Johnson, F. Walker.; Frick, Childs, 1883-1965."Late Tertiary Valentine and Ash Hollow formations of the Ogallala Group in north-central Nebraska contain two previously unnamed fossiliferous ash-bearing members. These, with four published members, provide a startigraphic framework for large collections of fossils in the Frick Collection in AMNH and other institutions. The Cornell Dam Member (new) in the basal Valentine Formation has salient lithic features and geologic relationships not found in other members of the Valentine. Basal channel sand disconformably overlying the Rosebud Formation contains macro- and microinvertebrate fossils (Norden Fauna, new) that also show the ecological and faunal distinction of this member. Fission track dates suggest that Valentine sediments spanned one and perhaps three million years. The Merritt Dam Member (new) of late Clarendonian to late Hemphillian age, disconformably overlies the Cap Rock Member of the referred Ash Hollow Formation. The Merritt Dam Member is less cliff forming than the Cap Rock Member, contains more volcanic ash and local channel and pond sediments. Tectonic readjustment caused deep channel erosion through the Ogallala into Arikaree rocks on the east flank of the Chadron Arch and eastward into the Cap Rock Member and the Valentine Formation. Sediments filling some of these channels contain vertebrate fossils overlain by vitric tuffs with a fission track date of 9.5 [+ or -] 0.8 Ma. The paleogeomorphology of the Ogallala Group and its depositonal framework is the product of overlapping alluvial fans of at least three paleodrainage systems which filled pre-existing valleys and spread sediments over a vast Great Plains area in Nebraska and South Dakota. In north-central Nebraska widespread aggradation and two short periods of degradation occurred during the Valentinian. Gradual aggradation during the early Clarendonian was followed by intermittent aggradation and degradation during the late Clarendonian and Hemphillian. The stratigraphic allocation and history of 98 collecting localities and documentation of 90 holotypes of fossil vertebrates and 13 plants provide a firm base for continued research. The prinipal aquifer in the Ogallala is the Crookston Bridge Member of the Valentine Formation"--P. 217.Item A unique cricetid (Rodentia, Mammalia) from the early Oligocene of Natrona County, Wyoming. American Museum novitates ; no. 2508(New York, N.Y. : American Museum of Natural History, 1972) Emry, Robert J.; Dawson, Mary R.; Skinner, Morris F.; Galusha, Ted."Two specimens, a partial right mandibular ramus with M[subscript 1]-M[subscript 3] and an isolated left M[subscript 2], represent a new genus and species of rodent, Nanomys simplicidens. The teeth of this rodent are so lacking in special characters that its phylogenetic position is difficult to interpret, but it seems best referred to the Cricetidae"--P. [1].