Aug. 13, 1917 



Origin of Alkali 



349 



rotten sandstone or immediately above the gypsum deposits. Both the 

 alkali and ash materials consist largely of the sulphates of calcium, 

 magnesium, and sodium, with small amounts of calcium bicarbonate, 

 sodium chlorid, and sodium nitrate. 



! 



Table XIII. — Soluble salts in Jurassic material ' 



[Results expressed as pounds per 2,000,000 of material] j 



SANDSTONE 



283. 



25-- 

 250. 



254- 

 255- 

 251- 

 253- 



Field No. 



Average . 



Location of samples. 



Vernal, Utah. .. 

 Richfield, Utah. 



Moab, Utah 



....do 



.do. 

 .do. 

 .do. 



Jurassic . 



Calcium 



(Ca). 



3,048 



3,248 



3,929 



962 



1,443 

 1,684 



1,524 



2, 263 



Macne- 

 sium(Mg). 



1,485 



None. 

 611 

 672 



515 

 699 



637 



660 



Carbonic Sulphuric 

 acid (CO3). acid (SO«). 



I, 040 

 360 

 440 

 816 

 640 

 480 

 760 



648 



8,402 

 10, 108 



329 



2,107 



2,535 

 3,88s 



4,025 



Chlorin 

 (Cl). 



2,836 



15,668 



None. 



284 



425 



284 



Trace. 



2,785 



SHALES 



284. 

 24. . 

 285. 



23- • 

 10. . 



Average , 



Vernal, Utah. .. 

 Richfield, Utah. 

 Vernal, Utah. .. 

 Richfield, Utah. 

 Nephi, Utah. . . 



Jurassic . 



Trace. 



3,048 



284 



2,978 



71 



638 



252. 



293- 



135- 



Average . 



Moab, Utah. . 

 Vernal, Utah. 

 Emery, Utah. 



Jurassic 



7,940 



2,887 



401 



3,742 



26, 072 



3,949 



384 



10, 135 



960 

 320 

 920 



733 



217, 960 

 54, 456 

 14, 152 



85, 522 



4, 960 

 283 

 567 



1,937 



Probably the most significant fact is the extremely small quantity of 

 alkali salts present in the country rock of the Quaternary period col- 

 lected from the Cache Valley, Utah. The soils of this area are very 

 productive and for the most part are largely free from alkali, especially 

 as compared with the soils of the other areas studied. Large alkali 

 areas such as occur elsewhere in the far West are unknown in this section. 

 Nineteen representative samples of the country rock from this district 

 were collected. The amount of soluble salts were so small that it was 

 not thought worth while to make an analysis for the individual salts 

 100303°— 17 3 



