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Book Chapter

Late Cretaceus strata exposed at Ponca State Park, Dixon County, Nebraska

By
Roger K. Pabian
Roger K. Pabian
Conservation and Survey Division, IANR, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0517
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Dennis R. Lawton
Dennis R. Lawton
Conservation and Survey Division, IANR, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0517
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Published:
January 01, 1987

Abstract

The outcrops of the Dakota Group and the Graneros Shalenental sandstones. As the viewer examines younger rocks toward Greenhorn Limestone interval of LateCretaceus age at Ponca the northwest, the original environments of deposition change, State Park provide an excellent sedimentary record of the last and these deposits give way to lagoonal, estuarine, or tidal and great marine invasion of the North American midcontinent. The mudflat deposits, which are finally overwhelmed by marine southeastern end of the outcrop area consists of the older continental sandstones. As the viewer examines younger rocks toward. the northwest, the original environments of deposition change, and these deposits give way to lagoonal, estuarine, or tidal and mudflat deposits, which are finally overwhelmed by marine shales and limestones.

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Contents

DNAG, Centennial Field Guides

North-Central Section of the Geological Society of America

Donald L. Biggs
Donald L. Biggs
531 Hayward Avenue Ames, Iowa 50010
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Geological Society of America
Volume
3
ISBN electronic:
9780813754093
Publication date:
January 01, 1987

GeoRef

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