Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . ^ of Santo Toroas there is a local exception to the usually uni-form direction of dip of the strata. Here the dip, instead of being tothe southeast, is to the northeast, according to information furnishedby Mr. D. D. Davis, superintendent of the Cannel Coal Companysmine. This disturbance is, without doubt, genetically connected withthe uplift of the Sierra Santa Rosa of Mexico. The northern limit of this plain is a great southward-facing escarp-ment, several hundred feet in height, which ha
Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . ^ of Santo Toroas there is a local exception to the usually uni-form direction of dip of the strata. Here the dip, instead of being tothe southeast, is to the northeast, according to information furnishedby Mr. D. D. Davis, superintendent of the Cannel Coal Companysmine. This disturbance is, without doubt, genetically connected withthe uplift of the Sierra Santa Rosa of Mexico. The northern limit of this plain is a great southward-facing escarp-ment, several hundred feet in height, which has been described underthe name Balcones escarpment. Along its foot is a strip of country. Fig. 1.—Map showing the general position of the Rio Grande coal fields. from 6 to 15 miles wide, which is broken by faults and in which therehas been considerable volcanic disturbance. This scarp is the south-ern edge of the vast Edwards Plateau. It is composed of practicallyhorizontal limestone strata, and attains an altitude of some 2,500 vegetation consists of grasses, which at the time of our visitwere mostly dead and dry, and of a variety of prickly plants belong- 1 R. T. Hill: Am. Geologist,, No. 1, Jan., 1890, pp. 17-18; Am. Jour. Sci., 3d series, 1887,Vol. XXXIV,pp. 291 et seq. 2 The geographic features of the region are more fully described in a paper by Mr. Hill and thewriter entitled The Geology of the Edwards Plateau and Rio Grande Plain: Eighteenth Ann. S. Geol. Survey, Part II, 1898, pp. 193-323. aughan.] PHYSICAL FEATURES. 15 |g to the Leguminosse, Rhamnacaae, and Cactacae, constituting thetaparral of the Mexicans. There are enormous orchards of
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