BALANCED ROCK, guarding TheWindows section of Arches NationalPark. Rock is Slick Rock Member ofEntrada Sandstone resting upon crinklybedded Dewey Bridge Member ofthe Entrada. White rock in foregroundis Navajo Sandstone. La Sal Mountainson right skyline. (Frontispiece)

UNITED STATES DEPARTMENT OF THE INTERIOR
ROGERS C. B. MORTON, Secretary

GEOLOGICAL SURVEY
V. E. McKelvey, Director

U.S. GOVERNMENT PRINTING OFFICE: 1975

Library of Congress Cataloging in Publication Data

Lohman, Stanley William, 1907-

The geologic story of Arches National Park.

(Geological Survey Bulletin 1393)

Bibliography: p.

Includes index.

Supt. of Docs. no.: I 19.3:1393

1. Geology—Utah—Arches National Park—Guide-books.

2. Arches National Park, Utah—Guide-books.

I. Title. II. Series: United States Geological Survey

Bulletin 1393.

QE75.B9 No. 1393 [QE170.A7] 557.3′08s [557.92′58]

74-23324

For sale by the Superintendent of Documents, U. S. Government Printing Office
Washington, D. C. 20402
Stock Number 024-001-02598-1

Contents

Page

Beginning of a monument 1

Graduation to a park 5

Early history 9

Prehistoric people 9

Late arrivals 12

Geographic setting 18

Deposition of the rock materials 20

Bending and breaking of the rocks 24

Uplift and erosion of the Plateau 33

Origin and development of the arches 37

Examples of arches 46

How to see the park 50

A trip through the park 52

Colorado River canyon 52

...

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