Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . Fig. 6.—Sandstone and clays above coal horizon (Santo Tomas seam) at Santo Tomas. and near the Habey ranch on the Nueces. It is seen 12^ miles southof Uvalde, between the Leona and Nueces rivers, along the road toBatesville, and apparently extends southward to Loma Yista. It alsooccurs on the divide in southern Uvalde County, between the Leonaand Frio rivers. Above this sandstone are alternations of finer-grained sandstonesand clays, and it is in these sandstones and clays that most of the
Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . Fig. 6.—Sandstone and clays above coal horizon (Santo Tomas seam) at Santo Tomas. and near the Habey ranch on the Nueces. It is seen 12^ miles southof Uvalde, between the Leona and Nueces rivers, along the road toBatesville, and apparently extends southward to Loma Yista. It alsooccurs on the divide in southern Uvalde County, between the Leonaand Frio rivers. Above this sandstone are alternations of finer-grained sandstonesand clays, and it is in these sandstones and clays that most of the lig-nite beds occur. NEOCENE AND PLEISTOCENE. The formations of these ages have received so much attention in thepaper entitled Geology of the Edwards Plateau and Rio Grande Plain,etc.,1 that it does not appear necessary to say a great deal here. Eighteenth Ann. Eept. U. S. Geol. Survey, Pt. II AN.] NEOCENE AND PLEISTOCENE DEPOSITS. 00 NEOCENE. In the area that is the subject of this paper the summits and highdivides are the remnants of a plain the general features of which havebeen previously described. This plain was once entirely covered witha surface coating of gravel to which Hill has given the name Uvaldeformation. These deposits form the top of the bluff along the RioGrande from Del Rio to beyond Santo Tomas, occupying a position 150to 200 feet above the river and extending eastward far beyond thelimits of the area discussed. PLEISTOCENE. Below the level of the Uvalde formation several terraces have beendeveloped along the principal stream. The uppermost of this seriesof terraces usually occurs about 120 feet below the Uvalde formation,
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