U. S. GEOGEAPHICAL SURVEYS WEST OF THE ONE HUNDREDTH MERIDIAN, 
1st Lieut. GEO. M. WHEELER, Cokps of Engineees, U. S. Akmy, in charge. 
PA.IIT I. 
REPORT 
UPON" 
THE INVERTEBRATE FOSSILS COLLECTED IN PORTIONS OF NEVADA, UTAH, 
COLORADO, NEW MEXICO, AND ARIZONA, BY PARTIES OF THE 
EXPEDITIONS OF 1871, 1872, 1873, AND 1874, 
BY 
. CHARI^ES A. WHITE, M. D. 
COMPRISING 
Chapter I.-GENERAL OBSERVATIONS UPON THE COLLECTIONS AND 
THE PERIODS THEY REPRESENT. 
II.—CLASSIFICATION. 
III. —FOSSILS OF THE PRIMORDIAL PERIOD. 
IV. —FOSSILS OF THE CANADIAN PERIOD. 
V. —FOSSILS OF THE TRENTON PERIOD. 
VI.—FOSSILS OF THE SUBCARBONIFEROUS PERIOD. 
VII.—FOSSILS OF THE CARBONIFEROUS PERIOD. 
VIII.—FOSSILS OF THE JURASSIC PERIOD. 
IX.—FOSSILS OF THE CRETACEOUS PERIOD. 
X.—FOSSILS OF THE TERTIARY PERIOD. 
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