. Annual report of the United States Geological Survey to the Secretary of the Interior . on of the county by the sharply markedline of the Balcones escarpment, which runs northwest and southeastacross the county from the vicinity of Cedar Valley toward RoundRock, in Williamson County. The country west of this line is that of 1 Detailed topographic and geologic maps of this county are published or in course 01 publicationby this Survey. 500 BLACK AND GRAND PRAIRIES, TEXAS. the highly dissected Lampasas (Edwards) Cut Plain, capped on thehighest points by the firm resistant strata of the Edwards
. Annual report of the United States Geological Survey to the Secretary of the Interior . on of the county by the sharply markedline of the Balcones escarpment, which runs northwest and southeastacross the county from the vicinity of Cedar Valley toward RoundRock, in Williamson County. The country west of this line is that of 1 Detailed topographic and geologic maps of this county are published or in course 01 publicationby this Survey. 500 BLACK AND GRAND PRAIRIES, TEXAS. the highly dissected Lampasas (Edwards) Cut Plain, capped on thehighest points by the firm resistant strata of the Edwards this district the high summits have an altitude of 1,350 feet in theextreme northwestern corner of the county, standing nearly 600 feetabove the catchment area of the Trinity reservoir, which follows thefoot of the western escarpment of the cut plain in Burnet this altitude the summit of the plain slopes southeastward tojust west of Austin, where it attains an altitude of 925 feet, the highestpoint on the eastern margin of the plateau, being just northwest of. 6 ^ pj 0 .5 MILES .,S^j^Z--ry Fig. 58.—Artesian map of Travis County, Texas. 1, Area where wells less than feet deep arelikely to be obtained from the Basement Trinity reservoir; 2, area where conditions are affectedby igneous rocks; 3, area where wells from to feet deep are obtainable from the Base-ment Trinity reservoir; #, flowing wells from Trinity reservoir; O. nonflowing wells from theTrinity reservoir. Spice wood Springs. East of the Bale-ones fault, northeast of McNeil,the Black Prairie country is a low-lying plain, the higher profiles ofwhich, as seen along the divide of the Brazos-Colorado drainage inthe northern border of the county and Mustang Ridge in the southernpart of the county, decrease in altitude from 900 feet at the westernto 600 feet at the eastern boundary. Between these two plains, southof Amboy station, 6 miles north of Austin, there i< a triangular
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