348 CHARLES D. IVALCOTT 



that "the principal scarp produced by the earthquake follows 

 the base of the alluvial foot slope of the Sierra Nevada, and has 

 a maximum height of about twenty feet. Where this height is 

 attained there is a companion fault scarp ten feet high facing in 

 the opposite direction, so that the net displacement is about ten 

 feet. At other points the main scarp is associated with others 

 running nearly parallel and facing in the same direction."' 



Professor Whitney, in his discussion of the earthquake^ sug- 

 gests that such disturbances might have their origin in the com- 

 pression exercised by an enormous weight of material raised to 

 a vertical height of two or three miles above the surrounding 

 country. 



The extent of the tilting of the Inyo Range to the south of 

 Waucobi Canyon is not readily determinable. The eastern face 

 of the range, toward Saline Valley, indicates the presence of a 

 fault line, and the steepness of the slopes near the valley that 

 the faulting is of relatively recent date. On the Owens Valley 

 side the slopes are also steep, but at the mouths of the canyons 

 there are great accumulations of talus that extend far out into 

 the valley, and the monoclinal character of the range is broken 

 by the presence of arching masses of strata of Triassic age, dip- 

 ping westward. 



North of the embayment, along the high, broad mass of the 

 White Mountain Range, no evidence of recent elevation or tilt- 

 ing was observed in the hurried trip through Owens Valley 

 along the western foot of the range. 



In a paper now in preparation I shall describe certain types of 

 faulting and tilting of monoclinal blocks of strata that are char- 

 acteristic of the Great Basin area of Utah, Nevada, and south- 

 eastern California. The principal illustrations will be taken from 

 faulted slabs of limestones collected in Waucobi Canyon on the 

 western slope of the Inyo Range, and it is anticipated that they 

 will aid in explaining the dynamics of such a movement as has 

 evidently taken place in that portion of the Inyo Range which 

 is described in this paper. Charles D. Walcott. 



^Mon. U. S. Geol. Survey, Vol. I, 1890, p. 361. ' Loc. cit, p. 276. 



