UNIVERSITY OF WASHINGTON PUBLICATIONS 



IN 



GEOLOGY 

 Vol. 1, No. 2, pp. 69-97, pis. 6, 7 January, 1918 



PALEONTOLOGY OF THE OLIGOCENE OF THE 

 CHEHALIS VALLEY, WASHINGTON 



by 

 KATHERINE E. H. VAN WINKLE 



CONTENTS Page 



Introduction 69 



Historical Review 70 



Stratigraphy 71 



Oligocene Fauna . . . 75 



Conditions of Environment 77 



Correlation 78 



Correlation Table of the Oligocene in Washington 79 



Conclusions 79 



Descriptions of New Species 81 



Plates . . 93 



INTRODUCTION 



The purpose of this paper is to record the results of an investigation made by 

 the writer during the years 1916 and 1917 on the faunas and stratigraphy of the 

 Oligocene formations exposed in Chehalis Valley between Chehalis and Porter, 

 Washington. The occurrence of Oligocene fossils near Porter has been noted 

 several times in the literature dealing with the Tertiary of the Pacific Coast. As 

 a rule these fossils are in an excellent state of preservation and occur at different 

 horizons from the basal to the uppermost beds of the formation. The region is of 

 considerable importance in establishing the marine Oligocene stratigraphic column 

 in western Washington. 



Stratigraphic field studies were carried on by means of a compass and tape 

 traverse on Porter, Gibson, Mox Chehalis, Williams and Independence creeks. All 



[69] 



