SURFACE OF SOUTH SLOPE OF FRONTAL MORAINE, CHILMARK, MARTHA'S VINEYARD.

WALKS AND TALKS

IN THE

GEOLOGICAL FIELD

BY

ALEXANDER WINCHELL, LL.D.

Late Professor of Geology and Paleontology in The University of Michigan

REVISED AND EDITED BY FREDERICK STARR
Of The University of Chicago

KD16/42

The required books of the C. L. S. C. are recommended by a
Council of six. It must, however, be understood that rec-
ommendation does not involve an approval by the Council, or
by any member of it, of every principle or doctrine contained
in the book recommended.

HARVARD

COLLEGE
LIBRARY

Copyright, 1894, 1898

By FLOOD & VINCENT

The Chautauqua-Century Press, Meadville, Pa., U. S. A.
Electrotyped, Printed, and Bound by Flood & Vincent

PREFACE.

IN writing this book for Chautauqua readers, Dr. Winchell desired that it should hold a position between text-books and books of light reading. No one was better qualified than he to prepare such a volume. In revising the work, the editor has left it as entirely Prof. Winchell's work as possible. Although a number of pages have been cut out, it is believed that the geological material is all retained and in the author's own words. Marginal comment has been introduced as a convenience to the reader and a few footnotes have been added.

The illustrations used in the work, with two exceptions, have been furnished through the kindness of Major J. W. Powell, Director of the U. S. Geological Survey.

The reader is advised to read the book in sections of related chapters, as follows:

I.-VII.-Surface Geology: The Drift and its origin. VIII-XIII.Strata: Their origin, contents, and po

sition.

XIV.-XX.-Igneous Agencies. Elevatory forces. XXI.-XXVI.-Economic Geology: The wealth of

the hills.

XXVII.-XXXIV.-Fossils.