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The relation of the different primary regions and their subdivions may be approximately indicated diagrammatically as follows:

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AUTHOR'S EDITION.

COLLEGE
LIBRARY.

DEPARTMENT OF THE INTERIOR. UNITED STATES GEOLOGICAL AND GEOGRAPHICAL SURVEY. F. V. HAYDEN, U. S. Geologist-in-Charge.

DESCRIPTION

OF A

FOSSIL PASSERINE BIRD

FROM THE

INSECT-BEARING SHALES OF COLORADO.

BY

J. A. ALLEN.

EXTRACTED FROM THE BULLETIN OF THE SURVEY, VOL. IV, No. 2,

WASHINGTON, May 3, 1878.

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