Correlation of Ordovician rocks of northern Alaska

By: , and 
Edited by: John D. CooperMary L. Droser, and Stanley C. Finney

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Abstract

The Ordovician sequences presented in this report were chosen to cover a range of depositional and structural settings found in northern Alaska. Consequently, the quality of lithostratigraphic, paleontologic, and sedimentologic data is variable. Until 1982, Ordovician rocks in northern Alaska were known only from a few, widely separated localities. Since then, several hundred Ordovician conodont collections were obtained during geologic mapping of chiefly metacarbonate rocks; some are from measured sections that contain a succession of pelagic and (or) warm, shallow-water index species, but others are isolated, single collections that merely contain species that are long-ranging, within the Ordovician. Graptolite collections are fewer than conodont collections, but they provide invaluable ties between carbonate and siliciclastic sequences. New macrofossil localities are rare. All these collections have increased the known areal extent of Ordovician rocks in northern Alaska (Fig. 1) at least thirtyfold. Faunal assemblages from carbonate rocks in northern Alaska indicate that this area was situated in low latitudes during the Ordovician.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Correlation of Ordovician rocks of northern Alaska
ISBN 1-878861-70-0
Year Published 1995
Language English
Publisher Pacific Section, Society for Sedimentary Geology (SEPM)
Publisher location Fullerton, CA
Contributing office(s) Alaska Science Center
Description 6 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Ordovician odyssey: Short papers for the seventh international symposium on the Ordovician system (SEPM Book 77)
First page 21
Last page 26
Conference Title Seventh International Symposium on the Ordovician System
Conference Location Las Vegas, NV
Conference Date June 12, 1995
Country United States
State Alaska
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