476 



GEOLOGY. 



Marine deposits. — Along the western coast of the United States 

 there are marine deposits reaching inland some distance from the 



Fig. 558. — A sink-hole of recent development near Meade, Kan. 

 (Johnson, U. S. Geol. Surv.) 



coast. They are known to extend up to altitudes of 200 or 300 feet 

 in California x and Oregon, and perhaps even higher. The Pleistocene 

 submergence indicated by the disposition of these beds must have 



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Fig. 559. — An unconformity between Pleistocene formations on the coast of Cali- 

 fornia near Santa Barbara. (Messrs. Arnold.) 



given origin to considerable bays in the lower courses of the Columbia 

 and Willamette valleys. In southern California there are two marine 

 Pleistocene formations separated by an unconformity 2 (Fig. 559) 



* Ashley, Jour, of Geol., Vol. Ill, pp. 446-50. 



2 The Messrs. Arnold, Jour, of Geol., Vol. X, pp. 117-135. 



