238 THE JOURNAL OF GEOLOGY. 



son for this is that there has been no distinct break in the continuity 

 of marine conditions throughout the epochs, only a gradual transition 

 of conditions. In this gradual transition there was, however, a reversal 

 of the epeirogenic movement of the coast from a process of depression 

 to a process of uplift. This turning point of the disastrophic pendu- 

 lum .... is believed to correspond well with the beginning of the 

 Pleistocene." With this definition of the Pleistocene, of which we 

 are not disposed to complain, there can be no doubt as to the age of the 

 remarkable changes of level which Professor Lawson describes. It is 

 to be hoped that at some future day he may give us an account of the 

 corresponding phenomena along a greater and connected stretch of 

 the California coast. The results announced in this paper purport 

 to be no more than the results of a general reconnaissance of the 

 regions described. 



RoLLiN D. Salisbury. 



