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- W2266820444 abstract "Abstract A sequence comprising 6,500 feet of Permian and Triassic rocks is exposed in the Medicine Range, south-central Elko County Nevada. Permian rocks include the Riepetown (1,100+ ft.), Pequop (2,400 ft.), and Loray (500 ft.) formations of the Arcturus Group; and the Kaibab (280 ft.), Plympton (510 ft.), and Gerster (1,200 ft.) formations of the Park City Group. Triassic strata are represented by the Thaynes Formation (500+ ft.). The succession of faunas and lithologies in the Pequop and Loray formations demonstrates a gradual regression from open marine deposits in the lower Pequop to very shallow marine and brackish or hypersaline deposits in the upper Pequop and Loray. Fusulinid limestones at the base of the Pequop in the northern Medicine Range grade southward within the Range to shallow-water silty deposits. The Thaynes Formation in the Medicine Range is interpreted as part of a transgressive sequence deposited by a westward-advancing interior sea during the late Early Triassic. A basal conglomeratic unit overlies the Gerster Formation (Upper Permian) on a disconformity with several feet of relief. A peak zone, characterized by the multi-element conodont Ellisonia triassica, is used to correlate the basal unit with the Meekoceras-bearing limestones to the east near Currie, Nevada. Ammonites of the Columbites Zone, including a specimen of Tirolites sp. cf. T. illyricus and several small specimens belonging to Columbites, were found about 250 feet above the base. Conodonts referable to Platyvillosus asperatus occur in a thin limestone bed about 300 feet above the base. Near the top of the section, poorly preserved ammonites occur in limestone beds that could be mistaken for the Meekoceras beds." @default.
- W2266820444 created "2016-06-24" @default.
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- W2266820444 date "1968-01-01" @default.
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- W2266820444 title "Permian and Triassic Biostratigraphy of the Medicine Range, Northeastern Nevada1" @default.
- W2266820444 hasPublicationYear "1968" @default.
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