Studies for Students 



THE EOCENE OF NORTH AMERICA WEST OF THE 

 100TH MERIDIAN (GREENWICH). 1 



CONTENTS. 



Geographic distribution and grouping of Eocene. 



The Fort Union formation. 



The Puerco formation. 



The Wasatch formation. 



The Bridger formation. 



The Huerfano formation. 



The Uinta formation. 



The Amyzon formation. 



The Manti formation. 



The Mojave formation. 



Bates Hole formation. 



The Kenai formation. 



The Puget formation. 



The Arago formation. 



The Martinez formation. 



The Tejon formation. 



The Umpqua formation. 



The Tyee formation. 



The Aturia formation. 



The Sphinx formation. 



The Pinyon formation. 



The San Miguel formation. 



Oscillations of land on Pacific coast. 



Temperature in Kenai time. 



Attitude of land in Kenai time. 



Succession of "lake" deposits. 



Origin of lake deposits. 



Criteria for distinguishing lacustrine from fluviatile deposits. 



Correlation Table Map. 



x The following essay is the outcome of a topical study undertaken by the writer 

 as a student at the University of Chicago. While it is based entirely on the literature 

 of the subject, it brings together so many scattered data concerning a series of forma- 

 tions which often seem intangible to the student, that it is printed in the belief that 

 the summation may be serviceable to students who wish to get information beyond 

 that of text-books, and who have not access to the original reports. — [Ed.] 



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