PNVIRONMENT OF THE TERTIARY FAUNAS OF THE 
PACIFIC COAST OF THE UNITED STATES* |, 
RALPH ARNOLD 
XII 
INTRODUCTION 
CORRELATION TABLE 
ACKNOWLEDGMENTS 
THE EOcENE PERIOD 
Relation of the Eocene to the Cretaceous 
Conditions immediately preceding and inaugurating the Eocene 
Distribution and character of sediments 
Conditions prevailing during the Eocene 
Orogenic movements and volcanic activity in the Eocene 
Climate during the Eocene 
THE OLIGOCENE PERIOD 
The Oligocene a period of elevation 
Conditions of erosion and deposition 
Fauna and climate of the Oligocene 
THE LoweER MI0cENE PERIOD 
Conditions inaugurating the lower Miocene 
Distribution and character of sediments 
Conditions of deposition 
Volcanic activity in the lower Miocene 
Faunas and climate of the lower Miocene 
Period of diastrophism in the middle Miocene 
THE Upper MIOCENE PERIOD 
Distribution and conditions of deposition 
Erosion and volcanic activity 
Faunas and climate of the upper Miocene 
THE PLIOCENE AND QUATERNARY PERIODS 
Conditions of deposition and character of sediments 
Diastrophism and volcanism in the Pliocene 
Diastrophism in the Quaternary 
Faunas and climate of the Pliocene and Pleistocene 
* Published with the permission of the Director, U. S. Geological Survey. 
+ Read before the Geological Society of America at the Baltimore meeting, Decem- 
ber 29, 1908. 
5°99 
