with, a general trend north and south, such 

 as the Summer Lake Him, Warner I-Iountains and 

 Rim and in fact nearly all the irregulari- 

 ties in the topography of this country. Re- 

 cent formations such as volcanic cones, f rag- 

 mental material foming rock flats or "De- 

 vil's Oarden" resulting from lava flows are 

 quite camon in this region, but this latter 

 factor, other than giving more or less va- 

 riety to the topography, lias had but little 

 to do with the shaping of the general features 

 of this country. largo inland lakes followed 

 this period of deformation and these lakes 

 have as a resrj.t gradually filled up with, 

 sediments fron the adjoining hills and have 

 formed the large flats or plains now forming 

 the sagebrush den art or dry farming lands of 







this reg.ion, Sismiier, Abert, Christmas and 

 probably Goop.e Lakes are ransants of these 

 la.rge in 3s. no. lakes. All of these lakes are 

 :oo>r very shallow, none of them being over 25 

 feet deep in ar?y place. The water of Abert, 

 Surimer and Christmas Lakes contains salts of 

 -nTxS .c w i p,l val u e . 



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