THE OVEKLAND EOUTE OGDEX TO SAN" FEAXCISCO- 



173 



some 



mount 



iiisulas in this body of water, and when the eye is trahiod to recog- 



the slopes. 



from point 



Humboldt Lake Humboldt 



trench that it has excavated in Lake Lahontan sediments since the 



last drying up of the ancient lake. 



miles 



stream 



low banks of marly clay belonging to the upper part of the lake de- 

 posits. At Mill City its channel begins to deepen, and at Eye Patch 

 the river is a little over 200 feet below the general level of the desert. 

 The general appearance of the trench cut by the river in the lake 



xxx\ 



The 



banks 



gravels, and lower lake clays) is easily distniguished where the beds 

 not obscured by debris. Below Rye Patch the banks decrease in 



are 



height; and south of Oreana they are in few places over 40 or 50 feet 



hi 



The total thickness 



over 200 feet. Borings in the desert valleys, however, have developed 

 the fact that sediments of similar character occupy the rock troughs 

 between the mountain ranges, in many places to very great depths, 

 probably thousands of feet. No way has been 

 how much of this filhng was deposited in the Q 

 much may be older, possibly of Tertiary age. 



devised 



Beyond Golconda the brown, rusty-colored ranges on both sides 



railroad, havin 



o 



exposures 



very 



Eglon and Tule (elevation 4,325 feet) are unimportant stations 



west of Golconda. 



aih' 



foothills on the south and is here far enough above the valley to afford 



led view to 



Humboldt 



this 



Little use appears to have been made of 



^ According to I. C. Russell, mamma- 

 lian bones were obtained at a number of 

 localities iu the sides of the Humboldt 

 and Walker Eiver canyons and, with the 

 exception of a single vertebra found in 

 the medial gravels, were derived from the 

 upper lake beds. So far aa det 



rnun 



they Include an elephant or mastodon, a 

 horse, an ox, and a camel. The fossils 

 are usually scattered through the sedi- 

 ments, more than one or two bones of the 



same individual being seldom found at a 

 single locality, though the elephant or 

 mastodon bones obtained in the Ilum- 

 boldt Canyon near Rye Patch constitute 

 nearly an entire skeleton. Manj^ of the 



had 



curiosities, 



however, before the collections that were 

 submitted to study were obtained. Re- 

 cently similar remains have been found 

 in the beach or bar deposits of the former 

 lake near the north end of Pyramid Lake. 



