John B. Reeside, Jr. 

 Memorial Library 



UNIVERSITY OF WASHINGTON PUBLICATIONS 



IN 



GEOLOGY 

 Vol. 1, No. I, pp. 1-67, pis. 1-5 February, 1916 



TERTIARY FAUNAL HORIZONS 

 OF WESTERN WASHINGTON 



by 

 CHARLES E. WEAVER 



CONTENTS Page 



Introduction 1 



Stratigraphy 2 



Eocene 3 



Oligocene 4 



Molopophorous lincolnensis Zone 4 



Turritella porterensis Zone 5 



Acila gettysburgensis Zone 5 



Lower Miocene 6 



Upper Miocene 7 



Faunal Localities in Western Washington 8 



Faunal Lists and Geographical Distribution 23 



Description of new Species 31 



Plates , . 57 



INTRODUCTION 



The formations of Washington west of the summit of the Cascades are almost 

 entirely of Cenozoic age with the exception of the central core of the Olympic- 

 Peninsula, the San Juan Islands and portions of the western slope of the Cascade 

 Mountains. The surface exposures consist largely of sands, gravels and clays 

 of glacial or fluviatile origin and were deposited during the Quaternary epoch. 

 However, in many places exposures of the older Tertiary rocks occur projecting 

 through the poorly consolidated sands and gravels. 



Because of the isolated occurrence of exposures of Tertiary formations it is 

 often extremely difficult to determine the stratigraphic relationships of one outcrop 

 to another. Many of the deposits formed contemporaneously in different areas 



