52 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Puget Sound region were disconnected from those to the south 

 in the Grays Harbor area. The shore hne of the present site 

 of the Puget Sound embayment appears to have existed some- 

 where between Seattle and Tacoma and to have extended in 

 an east to west direction from the present site of the Cascade 

 Mountains to the present location of the Olympics. The pres- 

 ent contact between the Eocene and Oligocene formations in 

 the Bremerton Inlet, or Kitsap County, area is much farther 

 north than the original southerly limits of the shore line. The 

 strata have been tilted from their original horizontal position 

 into a nearly vertical position and as a result those sediments 

 which formerly extended to the south have been entirely re- 

 moved by erosion. The lithologic character of the sediments 

 and the faunas occurring within them indicate that they were 

 deposited in shallow to moderately deep water. No products 

 of direct volcanic origin were poured out in this region during 

 the Oligocene epoch. This is in sharp contrast to the condi- 

 tions of volcanic activity during the Tejon. 



CONCLUSIONS 



The area involved in this investigation is of special impor- 

 tance because within it occurs one of the most complete sec- 

 tions of Oligocene strata to be found in the state. There are 

 approximately 8900 feet of conglomerates, shales and sand- 

 stones which are entirely of marine origin and rest unconform- 

 ably upon older Tejon basalts and sediments. The contact in 

 this area between the Tejon and Oligocene is obscured by de- 

 posits of glacial drift. The Oligocene strata form the north 

 flank of an extensive east to west trending anticline, the axis 

 of which has been deeply dissected by erosion. A marine fauna 

 of 44 invertebrates is now known. The horizon repre- 

 sented is upper Oligocene. The fauna is a unit from base to 

 top of section and is termed the Acila gettysburgensis zone. 



