Identifier: geologywaterreso02mein (find matches)
Title: Geology and water resources of Sulphur Spring Valley, Arizona
Year: 1913 (1910s)
Authors: Meinzer, Oscar Edward, 1876-1948 Kelton, F. C Forbes, Robert Humphrey, b. 1867 University of Arizona. Agricultural Experiment Station
Subjects: Geology Water-supply
Publisher: Washington : Govt. Print. Off.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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econdfoot. A part of the samples were tested only for total soluble saltsby means of the electric bridge, but the samples from 47 points wereexamined in the laboratory for total water-soluble salts (reported astotal soluble solids), for chlorine (reported as sodium chloride), andby the modified Hehners test for permanent hardness (reported ascalcium sulphate) and black alkali (reported as sodium carbonate).The results of the analyses are given in the table (pp. 172-181) andthose for the north basin are plotted on figure 32, the values shownbeing the average for the entire depth to which the boring was carried. GEOGRAPHIC DISTRIBUTION. Alkali is found in largest quantities in the clay of the barren flat ofthe north basin, but it is also found in the soils of a considerable areasurrounding the flat (fig. 32). North of the barren flat alkali occursin considerable quantities over a district that extends about to thenorth margin of township 14 but includes a belt extending some ALKALI. 163
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LEGEND Total soluble solids(per cent of total soil) O Less than.20 CD .20 to .40 0 .40 to .80 © .80 to 1.50 © 1.50 to 3.00 • More than 3.00 CD_>> 03 C a > £ 2 Less than .40 $ .40 to .80 ♦ .80 to 1.50 ♦ 1.50 to 3.00 ♦ More than 3.00 Black alkali (per cent of total soil) □ (None tn ED Less than .05E .05 to.10 >> 13cctf a .10to.20 a B .20 to .50 1 ■ More than .50 J J Ancient beach Outer limit of areahaving depth to waterof less than 15 feet Inner limit ofmesquite belt Contour interval 100 feet rFigure 32.—Map showing alkali in soil of north basin, Sulphur Spring Valley. 164 WATER RESOURCES OF SULPHUR SPRING VALLEY, ARIZONA. distance north of Willcox and perhaps other small areas in township13. It is absent, however, over much of the sandy region east ofWillcox. East of the barren flat it occurs in a belt from 1 to 2 mileswide, and west of the flat in a somewhat narrower belt. Alkali isalso found in a tract that lies east of the Arizona Eastern Ra

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