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terraces The writer is inclined, from present information, to the view 



of one general elevation of the California coast in post-Pliocene times, accom- 

 panied by minor oscillations, and by local differential movements, such as 

 that called for, for example, in the formation of San Francisco Bay 



It is probable that while the oscillations of post-Pliocene times have been 

 sufficient to connect the northern islands with the mainland, none of the 

 southern islands have had such connection since the post-Miocene period of 

 erosion. 



The most recent movement of the coast, as indicated by drowned valleys 

 and submarine features, is a comparatively slight depression, the evidence 

 for which, on the southern California coast, has already been given in detail. 

 The later history of the coast seems, therefore, to be most satisfactorily 

 summed up in a single post-Pliocene elevation, interrupted by minor reverse 

 movements, of which this most recent depression is probably one. 



Whether or not future investigation shall lead to modification of the 

 details of the coastal movements as here outlined, is immaterial to the main 

 conclusions of the present paper ; the principal point which it aims to establish 

 being the fact that the latest general movements of the islands and coastline 

 of southern California have been the same. R. D. S. 



CORRECTION. 



In Professor Spurr's article on "Succession and Relation of Lavas 

 in the Great Basin Region," in the last number of the Journal, the 

 caption of the table opposite page 642 should read : "Provisional 

 Correlation of Tertiary Lavas in the Great Basin," not "Great Britain." 



