The Siskiyou Island. 41 



This change having occurred at the close 

 of the Cretaceous period the continuation of 

 the history would open upon Eocene times. 

 The geological sediments of these Eocene 

 times west of the Cascade barrier were those 

 of shoaling waters, chiefly sand stones and 

 often abounding in finely preserved marine 

 fossils. An extensive belt of this rock not 

 covered by any later deposit may be seen 

 reaching from Denmark, a few miles north 

 of Cape Blanco, to a point near the mouth 

 of the Coquelle river, reappearing again 

 south of the entrance to Coos bay, where fine 

 exposures of their fossils are found, among 

 which are well preserved Cardita planicosta, 

 that may be seen near the lighthouse at Cape 

 Arago, in rock tilted to an angle of sixty 

 degrees. The rock reappears at the mouth of 

 the Umpqua and forms the line of picturesque 

 bluffs along both banks of that river to Scotts- 

 burg, and is again extensively exposed along 

 Elk creek to Drain. 



Further north the Eocene reappears 

 around Philomath and Corvallis. Here again 



