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Biostratigraphy Lower Permian Fusulinidae Upper Delta

Biostratigraphy Lower Permian Fusulinidae Upper Delta

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Full Title: Biostratigraphy and Lower Permian Fusulinidae of the Upper Delta River Area, East-Central Alaska Range

Author: Ronald G. Petocz


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From the original catalog copy: A Lower Permian fusulinid fauna was found in rocks of Mankomen age within a fault block in the Upper Delta River area, east-central Alaska Range. The section exposed in this area represents the youngest known upper Paleozoic sediments in the Alaska Range. Three members of the Mankomen Formation are recgonized and described: a lower Tuffaceous Sandstone Member, and Alternating Limestone-Shale Member, and a Limestone Member. Additional sedimentary rocks occur still higher in the section but are as yet unmapped. Eighteen species of fusulinids belonging to three genera are described from the Alternating Limestone-Shale Member and the Limestone Member. This fauna is divided into six assemblage zones on the basis of the fusulinid species. Collectively, the zones indicate a Lower Permian age, randing from late Asselian to middle Artinskian when compared to the zonation of Permian sections in the western Urals, USSR. The fusulinids belong to the Boreal faunal realm that includes the geosynclinal seas of the Alaskan Cordilleran, Franklinian, and Uralian geosynclines. Faunal evidence indicates temporary marine connections between Alaska and the Pacific Northwest, and between the Uralian and Tethyan regions. Correlations are suggested between the Alaska Range section and the following regions: southeastern Alaska; northeastern Alaska; northwestern Yukon Territory; Grinnell Peninsula, Arctic Archipelago; northwest Greenland; Spitsbergen; and the Ural region of the USSR.

Published: 3/20/1970

ISBN Number: 081372130X

Pages: 123

Product Category: Special Papers