As the Nation’s principal conservation agency, the Department of the Interior has basic responsibilitiesfor water, fish, wildlife, mineral, land, park, and recreational resources. Indian andTerritorial affairs are other major concerns of America’s “Department of Natural Resources.” TheDepartment works to assure the wisest choice in managing all our resources so each will make its fullcontribution to a better United States—now and in the future.

This publication is one in a series of research studies devoted to special topics which have beenexplored in connection with the various areas in the National Park System. It is printed at theGovernment Printing Office and may be purchased from the Superintendent of Documents, GovernmentPrinting Office, Washington, D.C. 20402.

Library of Congress Cataloging in Publication Data

McGrew, Paul Orman, 1909-

The geological history of Fossil Butte National Monument and Fossil Basin.

(National Park Service occasional paper; no. 3)

Bibliography: p.

Includes index.

1. Geology—Wyoming—Fossil Butte National Monument.

2. Geology, Stratigraphic—Eocene.

3. Paleontology—Eocene.

4. Fossil Butte National Monument, Wyo.

I. Casilliano, Michael, joint author.

II. Title.

III. Series: United States. National Park Service. National Park Service occasional paper; no. 3.

QE182.F67M3 557.87'82 75-17511

Contents

INTRODUCTION 1

LOCATION 1

HISTORICAL BACKGROUND OF RESEARCH 1

STRATIGRAPHY 5

Thaynes Limestone 7

Evanston Formation 7

Wasatch Formation 7

Basal Conglomerate Member 9

Lower Member 9

Main Body 11

Sandstone Tongue 11

Mudstone Tongue 12

Bullpen Member 12

Tunp Member 12

Age of the Wasatch Formation 12

Depositional Environment 13

Green River Formation 13

Fossil Butte Member 13

...

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