Vol. 6] Eeid: The Geomorphogeny of the Sierra Nevada. 151 



istics of the Lakeview connection of the Washoe Mountains and 

 the Sierra Nevada indicate that a relative compression at that 

 point has held up the crust-blocks forming the connection, while 

 allowing the more widely spread tensional stress to form the 

 diastrophic valleys on north and south. Taken in conjunction 

 with the directions of the main fault-lines, this would indicate 

 that the Virginia Range block overlapped the area composed of 

 the blocks within the Carson topographic area in such a manner 

 that a maximum compressive force was developed at the contact. 

 This condition would occur if the south end of the Virginia 

 Range were rotated clockwise, here westerly, about a vertical axis 

 somewhere to the north. This is not in discordance with the 

 known characteristics of the region influenced by such motion. 



(4) The north end of the Pine Nut Range seems also to have 

 been influenced by a force tending to move it in a westerly direc- 

 tion. This apparent force may have been, and probably was, the 

 resultant of the forces producing mere elevation. An impressive 

 fault-scarp bounds the Pine Nut Range on the north. The final 

 resultant of the two sets of forces from the Virginia and Pine Nut 

 ranges was to set up within the Carson topographic area a com- 

 plex of stresses and strains in addition to those it already pos- 

 sessed as part of the Sierra Nevada. The many north-south and 

 east-west faults were probably thus established. If the two main 

 compressive stresses at Lakeview and south of Carson were equal 

 or nearly so, these, together with the north-south forces of uplift 

 in the Sierra, would produce a rectangular system of faults. If 

 unequal, differential motion would occur along shear planes not 

 coincident with either of the rectangular lines. The character 

 of Kings Canon and its fault has been noted. The direction is 

 approximately 45° with the rectangular faults. The upper part 

 of the Ash Canon fault is likewise aligned. The faults bounding 

 the Lakeview Hill block also make angles of about 45° with the 

 main fault-line. Another prominent southwest-northeast fault 

 occurs three miles west of Lakeview. These diagonal fault-lines 

 are in all probability the result of the shearing stress set up by a 

 force acting westward at Lakeview. The projection into the val- 

 ley of the lobe southwest of Carson is almost certainly due to an 

 elevation of the Prison Hill block, caused in its turn by a prob* 



