DENVER, COLORADO

iii

But from these immense prairies may arise one greatadvantage to the United States, viz., the restriction of ourpopulation to some certain limits, and thereby acontinuation of the union. Our citizens being so prone torambling, and extending themselves on the frontiers, will,through necessity, be constrained to limit their extent onthe west to the borders of the Missouri and theMississippi, while they leave the prairies, incapable ofcultivation, to the wandering and uncivilized Aborigines ofthe country.Zebulon Pike

Exploratory Travels Through The Western Territories of North America comprisinga voyage from St. Louis, on the Mississippi, to the source of that river,and a journey through the interior of Louisiana and the north-eastern provincesof New Spain. Performed in the years 1805, 1806, and 1807, by order of theGovernment of the United States. By Zebulon Montgomery Pike. Published byPaternoster-Row, London, 1811: W. H. Lawrence and Company, Denver, 1889.Quotation from pages 230-231, 1889 edition.

UNITED STATES DEPARTMENT OF THE INTERIOR
CECIL D. ANDRUS, Secretary

GEOLOGICAL SURVEY
H. William Menard, Director

UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1980

Library of Congress Cataloging in Publication Data

Trimble, Donald E.

The geologic story of the Great Plains.

(U.S. Geological Survey Bulletin 1493)

Bibliography: p. 50

Includes index.

Supt. of Docs. no.: I 19.3: 1493

I. Geology—Great Plains. I. Title.

II. Series: United States Geological Survey Bulletin 1493.

QE75.B9 no. 1493 [QE71] 557.3s [557.8] 80-607022

For sale by the Superintendent of Documents, U.S. Government Printing Office
Washington, D.C. 20402

CONTENTS

Introduction 1

What is the Great Plains? 5

The Great Plains—its parts 7

Early history 10

Warping and stream deposition 11

Sculpturing the land 18

Landforms of today—The surface features of the Great Plains 1

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