GEOMORPHOGENY OF THE KLAMATH MOUNTAINS 461 



8. In these experiments the presence of water was not observed to exert any 

 influence. 



9. It is believed, from the results of other experiments now being carried out 

 but not yet completed, that similar movements can, to a certain extent at least, 

 be induced in granite and other harder crystalline rocks. 



In the discussion of Professor Adams' paper remarks were made by 

 G. K. Gilbert, B. K. Emerson, J. E. Wolff, and C. D. Walcott, with re- 

 plies by the author. 



The Secretary made announcement of detaifs concerning the custom- 

 ary dinner, which was to be at 7 o'clock in the evening, and also con- 

 cerning the reception tendered the Society by Doctor Merrill on Friday 

 evening. 



The second paper read was 



GEOMORPHOGENY OF THE KLAMATH MOUNTAINS 

 BY J. S. DILLER 



\_Abstract\ 



During the Neocene the Klamath Mountain region of northwestern California 

 and southwestern Oregon by long continued erosion was reduced to a peneplain 

 and the resulting marine sediments rich in fossils deposited along the ocean border 

 recorded its age. 



The Neocene strata were compressed and tilted, and with the Klamath peneplain 

 and monadnocks uplifted somewhat differentially several hundred feet above its 

 former level. 



The invigorated streams in the rather long succeeding epoch of stability cut wide 

 valleys across the peneplain to the coast, where extensive wave-cut terraces were 

 developed. 



A much greater differential uplift followed, to an altitude for the Klamath pene- 

 plain near the coast of 1,200 to 2,000 feet, and near the crest of -the range 7,000 feet, 

 causing the streams to cut deep canyons before the close of the glacial period. 



Near the northern border of the Klamath mountains on the coast there has been 

 a recent subsidence converting the lower courses of the rivers into tidal inlets. 



Remarks on the paper were made by the President, M. R. Campbell, 

 W. M. Davis, G. O. Smith, and G. K. Gilbert. 



The next paper was read, in the absence of the author, by C. D. 

 Walcott. 



ORIGIN AND STRUCTURE OF THE BASIN RANGES 

 BY J. E. SPURR 



This paper is printed as pages 216-270 of this volume. 



LXVI— Bull. Geol. Soc. Am., Vol. 12, 1900 



