332 The American Geologist June, i89o 
and sandstone deposits until it strikes an impenetrable strat- 
um and collects on it, or it is the rain and snow falling in the 
south eastern portion of the plains following these deposits. 
Like all limestone waters they are clear and sparkling, possess- 
ing an agreeable taste. They are charged with carbonic acid 
and contain carbonate of lime and magnesia in small quanti- 
ties, small quantities of iron, silica and potash, sometimes sul- 
phates, and little or no organic matter. 
SECTIONS OP WELLS IN DIFFERENT LOCALITIES. 
Average of wells in San Ayigelo. 
Soil, chocolate color, marly 3 to 10 ft. 
Concrete limestone 20 to 50 ft. 
Total 23 to 60 ft. 
Lipan Flat. 
Soil, chocolate color, marly 3 to 10 ft. 
Clay, red or yellow 40 to 50 ft. 
Limestone 15 to 18 ft. 
Total 58 to 78 ft. 
Prairie North of San Angelo. 
Soil, chocolate color marly 3 to 5 ft. 
Clatj, red 27 to 40 ft. 
Limestone, blue hard 10 to 20 ft. 
Sandstone, gray 15 to 20 ft. 
Total 95 to 150 ft. 
South Concho, 40 miles south of San Angelo. 
Soil, calcareous grayish 3 ft. 
Limestone, changing in color and density 100 ft. 
Limestone and clay of various colors, changing in thin 
layers 125 ft. 
Sandstone, gray ? ft . 
Total 228 ft. 
Middle Concho, 50 miles west of San Angelo, 
Soil, calcareous gray 3 ft. 
Limestone, changing in color and density 80 ft. 
Clay and Limestone, of various colors, changing in thin 
layers 150 ft. 
White Sandstone 25 ft. 
Total 258 ft. 
Ay'tesian wells. — All the conditions favoring artesian wells 
are present : — impenetrable strata, sufficient dip of the forma- 
tion and water in abundance, — but as the water has to be pro- 
cured from the Carbonic deposits, it will probably be found 
brackish, as water has never been found otherwise in this form- 
