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Show - 42 UNDERGROUND WATER IN VALLEYS OF UTAH. Record of Rio Grande Western Railway Company's well at Salt Lake City. Thickness in feet. Thin strata of clay and sand 130 Clay and hardpan. Red sand Clay and hardpan.. Gray sand 40 30 60 5 Clay and sand 44 Sand . 8 Clay 20 Sand 13 Hard clay 6 Sand 8 Clay. 10 Sand 18 Clay. 20 S a n d . . . . 4 C l a y . . . 10 Blue sand._ .-„ 12 Clay 5 Blue sand 30 Hard clay 10 1 12 4 28 30 3 Depth in ieet. 1- 130 130- 170 170- 200 200- 260 260- 265 265- 309 309- 317 317- 337 337- 350 350- 356 356- 364 364- 374 374- 392 392- 412 412- 416 416- 426 426- 438 438- 443 443- 473 473- 483 483- 484 484- 496 496- 500 500- 528 528- 558 558- 561 Thickness in feet. Sand 8 Soft blue clay 40 Sandy blue clay 40 Hardpan 2 Sand 16 Sandy gray clay 18 Red sand 36 Gravel. 10 Blue clay 76 Clay and sand, alternating every 12 or 18 inches. 84 Hardpan 8 Sand and gravel 11 Blue clay 16 Gray clay . 24 Sandy gray clay 13 Quick sand 15 Blue clay 21 Sandy blue clay. 11 Quicksand 10 Gray njay - 11 Fine bilie sand. Tough blue clay. Hardpan Fine sand Hard blue clay.. 3 12 2 21 4 Depth in feet. 561- 569 569- 609 609- 649 649- 651 651- 667 667- 685 685- 721 72L- 731 731- 807 807- 891 891- 899 899- 910 910- 926 926- 950 950- 963 963- 978 978- 999 999- 1,010 1,010- 1,020 1,020- 1,031 1,031- 1,034 1,034- 1,046 1,046- 1,048 1,048- 1,069 1,069- 1,073 Sand and gravel Clay Gravel Gray sandy clay Tough blue clay Hardpan Although the general composition of the old lake deposits is known, not enough information has been accumulated to enable very definite statements to be made concerning the detailed distribution of the sediments. A comparison of available well records shows that the alternating beds of sand, clay, and gravel, generally, can not be recognized as being equivalent in the several wells, and from the present evidence it appears that while there are great thicknesses of both sand and clay, which must have a more considerable lateral extent than the beds nearer the mountains, the lake deposits are lenticularly arranged. Since no correlation has been established, the structure of the lake deposits is not known. Apparently they are approximately horizontal, but with a slight inclination toward the lake from the highlands. This is indicated by the pressure obtained in artesian wells and is proved in a few instances by well records. In the broad lowland west of Jordan River there is an abundance of water. Throughout practially all of this area ground water lies within 10 feet of the surface, and water is contained in the underlying deposits down to an unknown but considerable depth. Apparently flowing wells can be obtained anywhere within this area. Although the water is so generally distributed, it is profitably recovered only from the more porous, coarser textured deposits of sand and gravel, which constitute natural reservoirs and in which the water moves more readily. Accordingly, water is found at several horizons in the course of sinking a deep well. In the Rudy well, for instance, 1,002 feet deep, situated in sec. 5, T. 1 N., R. 1 W., 25 water horizons from which surface flows were obtained are reported. A record of this well is not available, but " good strong" flows besides minor ones were recorded, respectively, at 400, 508, 685, 753, and 881 feet. Though water is so abundant, this lowland region is thinly populated, the chief drawback to its settlement being the presence of much alkali in the soil over a considerable part of |