Geology and Natural History. 317 
upheaval. nyo range, on the other hand 
ancient, being a part of the great Paleozoic formation of the 
Grea n, and consists of limestones, sandstones, and other 
land north of the valley and south of Mono lake there are 
abundant indications of former voleanic activity, in the form of 
solfataras and hot springs 
ndependence. In the region to the south of the lake the vibra- 
ons were felt as approaching from the northwest; at Lone Pi 
they were referred to the high mountains in the immediate vicinity 
i assign 
” 
Was always more to the south of west as we proc north. 
€ recurrence of subterranean noises preceding or accompany! 
the shocks is confirmed, and the noises are re the cracking 
brush slope.’” A tidal wave was produced in Owen’s lake, but 
caused no damage beyond the temporary inundation of the shore. 
