Geology . estored, and its waters rose about 30feet higher than before, but did not find an outlet. The two stages ofhigh water in Lake Bonneville and Lahontan have been thought tocorrespond with epochs of glaciation in the adjacent mountain regions. At some stages of the lakes history, the condition of the waterwas such as to allow mollusks to live in it, while at other stages itappears to have been so saline as to have prevented its facts point to considerable fluctuations in the climate duringthe history of the lake. The deposits in Lake Lahontan are comparable to those in
Geology . estored, and its waters rose about 30feet higher than before, but did not find an outlet. The two stages ofhigh water in Lake Bonneville and Lahontan have been thought tocorrespond with epochs of glaciation in the adjacent mountain regions. At some stages of the lakes history, the condition of the waterwas such as to allow mollusks to live in it, while at other stages itappears to have been so saline as to have prevented its facts point to considerable fluctuations in the climate duringthe history of the lake. The deposits in Lake Lahontan are comparable to those in LakeBonneville (Figs. 543 and 544), but among the clastic sediments arefound thin beds of volcanic ash, and the relative importance of thechemical precipitates is greater. The main precipitate was calcium 1 Russell, Mono. XI, U. S. Geol. Surv. GEOLOGY carbonate, which, in the form of calcareous tufa, was deposited duringat least three distinct Btages of the lakes history (Fig. 545). The >ia^ k&. ^s^kji
Size: 1821px × 1372px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectgeology
