72 RIO GRANDE COAL FIELDS OF TEXAS. [btjll.k 
Dumble correlates with the upland gravel deposit of the Rio Granc 
embayment, previously mentioned by Hill and Penrose. 
1895. Dumble (E. T.). Cretaceous of western Texas and Coahuila, Mexico: Bui 
Geol. Soc. America, Vol. VI, April, 1895, pp. 375-388. 
Pages 383 and 384 contain references to the geology of the regio 
of the Rio Grande Plain. 
1895. Dumble (E. T.). The soils of Texas; a preliminary statement and classifies 
tion: Texas Acad. Sci., pp. 25-60. 
Several allusions are made to the geology of the Rio Grande region 
and data on the soils is given. 
1896. Harris (G. P.). The Midway stage: Bulletins American Paleontology 
Vol. I, No. 4. 
Pages 13 and 14 contain a discussion of the basal Eocene along the 
Rio Grande. 
1897. Harris (G. D.). The Lignitic stage; Part I, stratigraphy and pelecypoda 
Bulletins American Paleontology, Vol. II, No. 9, pp. 198, 199 (6, 7) . 
In this paper Harris discusses the probable occurrence of the Lignitic 
Eocene (Chickasawan) along the Rio Grande. 
1897. Vaughan (T. Wayland). The asphalt deposits of western Texas: Eighteenth 
Ann. Rept. U. S. Geol. Survey, Pt. V (continued) ; Mineral Resources of the 
United States, 1896, Nonmetallic products, except coal, pp. 930-935. 
This paper describes the occurrence of asphalt in the Brackett quad- 
rangle and along the Nueces River in southern Uvalde County (Uvalde 
quadrangle). 
1898. Hill (R. T.) and Vaughan (T. Wayland). Geology of the Edwards Plateau 
and Rio Grande Plain adjacent to Austin and San Antonio, Texas, with reference 
to the occurrence of underground waters: Eighteenth Ann. Rept. U. S. Geol. 
Survey, Pt. II, pp. 199-321. 
Contains numerous references to the geology of the Rio Grande 
region below Del Rio. 
