The Siskiyou Island. 43 



the coast line from Cape Blanco to the mouth 

 of the Umpqua, strikes one as very great, 

 while the uniformity of their materials and 

 the abundance of their fossil remains alike 

 speak of long continued uniform history. 



Anyone may verify these convictions by 

 examining the thickness, uniformity and 

 abundant life of these rpcks on the North 

 Umpqua twenty miles east of Roseburg, the 

 thickness of deposit along both banks of the 

 Umpqua and Elk creek from Elkton to the 

 ocean, and at Cape Arago where again they 

 are richly fossiliferous. 



Let it then be accepted that this whole 

 region north of Siskiyou island enjoyed a 

 long period of comparative quiet after the 

 Cascade revolution. But the completion of 

 the plan of North America calls for another 

 world belt, and it comes, this time as another 

 upfold of the crust of the earth beginning 

 again under the sea bed and reaching from 

 California to Alaska. Its line falls upon our 

 island of Siskiyou, and continues northward 

 and southward a sea dyke in its early stages, 



