RIO GRANDE COAL FIELDS OF TEXAS.
name Uvalde formation is proposed for the extensive upland gravel sheet blanketing that region.
1891. Hill (R. T.). Preliminary notes on the topography and geology of northern Mexico and southwest Texas and New Mexico: Am. Geologist, Vol. VIII.
On page 135 "the westward embayment of the Rio Grande from the coast" is described.
1891. White (0. A.). Correlation papers—Cretaceous: Bull. U. S. Geol. Survey
On pages 116 and 117 reference is made to the region between Eagle Pass and Laredo. The same opinion that was expressed in the American Journal of Science, Vol. XXV, concerning the presence of Laramie along the Rio Grande below Eagle Pass is reiterated here. Laramie is stated to occur in the valley of the Nueces also. The name Eagle Pass beds is used for the beds containing the coal at Eagle Pass.
1891. Hill (R. T.). Notes on the Texas-New Mexican region: Bull. Geol. Soc.
America, Vol. 11l (proceedings of the Washington meeting), pp. 85-100.
Pages 93 to 95 contain a description of the Rio Grande embayment.
1892. Dumble (E. T.). Notes on the geology of the valley of the Middle Rio Grande:
Bull. Geol. Soc. America, Vol., 111, April, 1892, pp. 219-230.
Dumble describes and discusses the section from Del Rio, Valverde County, to Webb bluff, in the northern part of Webb County, and correlates the Rio Grande and the Colorado River section.
1892. Hill (R. T.). On the occurrence of artesian and other underground waters
in Texas, New Mexico, Indian Territory, etc.: Final Reports of the Artesian
and Underflow Investigations of the U. S. Department of Agriculture.
Accompanying this report is a map showing the general geologic and topographic features of the State. In the text there is a descrip tion of the topography of the region. The southern extension of the Edwards Plateau and its termination by the Balcones fault escarpment, which runs east and west, a little north of a line joining San Antonio and Del Rio, is also described. At the foot of this escarpment is the vast level plain which Hill designated the "Rio Grande embayment." Hill states that this plain is covered to a very great extent by surface gravel. The following pages contain statements concerning the Mid dle Rio Grande region: 58, 63, 65, 66, 67, 68, 74, 76, 88, 91, 92, 119, and 123 to 125.
1892. Dumble (E. T.). Report on the brown coal and lignite of Texas: Geol. Survey
On the map accompanying this report several outcrops of coal in the Rio Grande region are indicated. Pages 137 to 139 contain a descrip tion of the section of the Eocene from a point on the Rio Grande 3 miles below the northern boundary of Webb County to Laredo.
1892. McGee (W J). The Lafayette formation: Twelfth Anu. Rept. U. S. Geol.