. The geography of Texas, physical and political. Fig. 22. Artesian Well on Bosque Farm,(as it appeared in 1890) Four MilesWest of Waco, McLennan County, and248 Feet above the Public Square slope. Thus far wells have shown the existence of water-bearing strata in certain formations belonging to four ofthe rock systems — the Neocene, the Eocene, the Creta-ceous, and the Carboniferous. The waters of the last, inthe Central basin, contain so much mineral matter as to be SURFACE AND UNDERGROUND WATERS 37 of little value, and some of the wells near the coast furnishbrackish or sulphurous waters. Of
. The geography of Texas, physical and political. Fig. 22. Artesian Well on Bosque Farm,(as it appeared in 1890) Four MilesWest of Waco, McLennan County, and248 Feet above the Public Square slope. Thus far wells have shown the existence of water-bearing strata in certain formations belonging to four ofthe rock systems — the Neocene, the Eocene, the Creta-ceous, and the Carboniferous. The waters of the last, inthe Central basin, contain so much mineral matter as to be SURFACE AND UNDERGROUND WATERS 37 of little value, and some of the wells near the coast furnishbrackish or sulphurous waters. Of the water-bearing beds,those of the lowermost Cretaceous, known as the Trinity. Fig. 23, Map showing the Artesian Water Areas of TexasThe sign • in many cases represents groups of vrells sands, are the most valuable in the state, on account ofthe good quality of the water and its abundant flow. Artesian water is struck at various depths, and usually more thanone water-bearing stratum is encountered in the same well, especiallyif it be a deep one. The well at Marlin, 3330 feet, is said to be the 38 THE GEOGRAPHY OF TEXAS deepest in the state. AVater was encountered at 3200 feet and atthe bottom. The latter flow is warra and has a pressure of nearly ahundred pounds to the square inch. The experimental well at Gal-veston is 3070 feet deep. Water was encountered at nine differenthorizons, the strongest flow probably at 2920 feet. This well was adisappointment to the citizens, as it furnished brackish water. Theaverage depth of the wells at Waco is estimated by R. T. Hill at 1842feet.^ Good flows have been obtained from two horizons. At FortWorth four horizons have
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