70 



GEOLOGICAL niSTOKY OF LAKE LAHONTAN. 



where the depth was 224 feet, as shown on the accompanying map, are re- 

 ported by Prof. F. W. Clarke as follows: 



Onelitei of water 



j contains, in 



gramuit s — 



Constituents. 



Silica (SiOz) 



Magnesium (Mg) — 



Calcium (Ca) 



Sodinm (Na) 



Potassium (K) 



Chlorine (CI) 



Sulphuric acid (SO4) . 



Carbonic acid (CO3) by ditierence . 

 Total 



as 



C o 





0. 0075 

 0. 0391 

 0. 0207 

 0. 8577 

 Trace. 

 0. 5875 

 0. 5275 



2. 0460 

 0. 4695 





0. 0075 

 0. 0J75 

 0. 0170 

 0. 8530 

 Trace. 

 0. 58C0 

 0. 5125 



2. 0081 

 0. 47S4 



2. 5155 2. 4875 



Constituents. 



Probable com- 



hioatiqu (ex- 

 firessed in 



fi'amiilesper 

 ittr). 





o.':9 

 1.55 



l.l^O 



34.11 



Trace. 

 23.36 

 20.96 



0.30 



1.51 



0.71 



34.29 



Trace. 



23.32 



20.61 



81.33 

 18.67 



80.73 

 19.27 



Silica(SiOj) 



Magnesium carbonate (MgCOa) . 



Calcium carbonate (CaCOa) 



Sodium chloride (NaCl) 



Sodium sulphate (NaaSOa) 



Sodium carbonate (NasCOa) 



IK 



0. (IU75 

 0. i:)69 

 0. 0667 

 0. 9081 

 0. 7803 

 0. 5157 



®— . 



- 4» .0 



I 2. 4752 

 Loss 0.0403 



Total . 



V3 



0. 0075 

 0. 1313 

 0. 044U 

 0. 9558 

 0. 7580 

 5339 



2. 4305 

 0570 



*2. 5155 t2. 4875 



?.39 per ceut. accounted for. 



1 97.66 per cent, accounted for. 



As in the case of the other lakes of the Great Basin, situated at an ele- 

 vation of less than 5,000 feet, the shores of Walker Lake are totally lacking 

 in arboreal vegetation except at the river mouth, and are clothed only with 

 desert shrubs. At the northern end, and following the immediate shores of 

 the Walker River for many miles, are luxuriant cottonwood groves, to- 

 gether with willow-banks and meadow-lands. 



At the northern end, the river is building out a low delta of fine silt, 

 and remnants of similar deltas, at higher levels, may be seen as one follows 

 up the river. A change in the level of the lake is recorded by dead trees 

 standing in the water, which show that it has risen at least four or five feet 

 in recent years. 



The waters at a distance from the river mouth are of a clear deep blue, 

 changing to a bright green tint near the shore, as in Pyramid Lake. They 

 are charged with saline matter to .such an extent that carbonate of lime is 

 now being deposited. The calcareous tufa now forming cements the gravel 

 and sands of the shore into compact strata or forms rosette -shaped masses, 

 wth isolated pebbles for nuclei. 



