88 
Tkansactions Texas Academy op Science. 
Dumble^ Edwin T. 
“In nearly every county between tbe ninety-seventb and ninety-eighth 
meridians and east of this outcrop, artesian water is obtained in wells 
varying from 200 to 2,000 feet. That it is equally favorable to a similar 
supply in its southern portion is shown by the line of great springs or 
natural artesian wells, which find their head in it and stretch from Wil- 
liamson county southwest by Austin, San Marcos, and New Braunfels 
towards the Pecos.” 
The Central Basin Pegion: Its extent, tqpography and geology. 
“The general dip of all the strata in the eastern portion of the basin 
is to the northwest, but its elevation along its eastern border is less than 
in almost any portion of it, consequently there can be little hope of finding 
artesian water from any catchment area ou this side, although some of 
the strata ( the lower sandstone and shales ) are well adapted for carrying 
water, and, where suitable topographic conditions exist, do furnish arte- 
sian water. An instance of this is found in the flowing well at Grordon, 
but such cases are the exception and not the rule. The same series of 
sandstone and shales are exposed on the southeastern border and the 
flowing wells at and around Trickham and Waldrip find their supply in 
them. The conditions are very favorable in the valley of the Colorado 
and .some distance north, between the ninety-ninth and one-hundredth 
meridians for similar wells. Similaa* rocks are exposed on the 
western border of this basin, in the vicinity of Van Horn .and farther north, 
in the Guadaloupe Mountains. They are reached by a well 832 feet deep, 
at Toyah, some 70 miles east of Van Horn. This well has an abundant 
flow. * * 
“The quality of the water from every well thus far secured in this 
basin, which has its origin in this series of rocks [Carboniferous] is highly 
saline, and it is safe to assume from this and from the character of the 
deposits that no fresh water can be obtained from this source. * * 
“If there be any other hope for an lartesian water supply in this region, 
the catchment area must be either in the Pre-Carboniferous rocks of the 
Central Mineral Region and the Wichita Mountains, or in the Cuadaloupe 
and connected ranges. That such a catchment area exists on the south 
is fully proved by the powerful springs at Lami>asas and in San Saba 
county, all of which have their origin below the rocks of Carboniferous 
age.” 
The Staked Plains: Its geology and water-bearing conditions. The 
opinion is advanced “that the probabilities of artesian water on the plains 
are rather unfavorable than otherwise.” 
The Trans-Pecos Mountain District: Topography and geology. The 
conditions of structure prevent any other than a general unfavorable re- 
port, though in certain localities artesian water may be obtained. 
124. , State Geologist. 
Important Results of the Texas Survey. 
Correspondence. 
Amer. Geologist^ Vol. VII^ pp. 267-269. Minneapolis, Apr., 
1891. 
