VOLUME XXIX NUMBER 7 
THE 
POURNAL OF GEOLOGY 
OCTOBER-NOVEMBER 10921 
THE MARINE TERTIARY OF THE WEST COAST OF THE 
UNITED STATES: ITS SEQUENCE, PALEOGEOGRA- 
PHY, AND THE PROBLEMS OF CORRELATION: 
BRUCE L. CLARK 
University of California, Berkeley 
INTRODUCTION 
Considerable work has been done on the marine Tertiary 
deposits of the West Coast during the past ten years, and some of 
the discoveries that have been made have greatly modified many 
of our previous conceptions. The purpose of this paper is to 
review some of the most salient facts concerning the stratigraphic 
_ divisions, paleogeography, and correlation of these horizons in 
order to give the reader some idea of the present status of this 
knowledge. 
The paper includes a correlation table of the marine West 
Coast Tertiary. The construction of such a table is a very difficult 
task, and it will undoubtedly be a good many years before a table 
can be made which will be satisfactory to everyone working in this 
field. None of the West Coast Tertiary horizons has been 
thoroughly studied: there is a notable lack of detailed mapping, 
and most of the faunas have been inadequately monographed. 
The West Coast Tertiary still offers some of the most important 
problems for stratigraphic and paleontological research in the 
United States, and if the reader can obtain from this paper some 
t Read before Geological Society of America, December, 1920. 
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