Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . ith fossils, Cyprimeria, Inoceramus, Exogyra, etc 35 2. Layer of clay containing many limestone nodules and fossils 1 1. Clay. Above the soft sandstone (No. 11) are two other prominent sand-stone ledges, about 30 feet apart, the upper of which is conglomeritic. The strike of the rocks at the foregoing exposure is southwest andnortheast, dip 20° to 30° SE. Fossils from No. 3 {field No. 299).Ostrea sp. Exogyra costata Say sp., fragments of a large sp
Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . ith fossils, Cyprimeria, Inoceramus, Exogyra, etc 35 2. Layer of clay containing many limestone nodules and fossils 1 1. Clay. Above the soft sandstone (No. 11) are two other prominent sand-stone ledges, about 30 feet apart, the upper of which is conglomeritic. The strike of the rocks at the foregoing exposure is southwest andnortheast, dip 20° to 30° SE. Fossils from No. 3 {field No. 299).Ostrea sp. Exogyra costata Say sp., fragments of a large sp., the same as for field Nos. 297 and 298. OVERTURNED FOLD NORTH OF SHAFT OF SAN CARLOS COAL COMPANY. A short distance north of the shaft of the San Carlos Coal Companythere is a small overturned fold accompanied by an overthrust fault. Onthe overthrust side ol the fault a fossil if erous horizon is exposed, but it 1 The information concerning what part of the coal seam would coke was furnished by Mr. Maloney,mine superintendent. Samples of the coke were furnished by the mine officials. 2 Or vaughan.] SECTIONS IN VICINITY OF SAN CARLOS. 81 was not determined which of the horizons it represents, i. e., whetherthe one just below the coal or the one at the base of the section of themountain. Fossils from favM north of shaft of San Carlos Coal Company {field No. 300). Ostrea elegantula Newberry. Exogyra costata Say var. Inoceramus proxiinus Tuomey. • Cyprimeria sp. Cardium alabamense Gabb. Rostellites sp. Gyrodes sp. Gyrodes crenata Conrad? Schloenbachia delawarensis (Morton). Placenticeras guadalupse (Roemer). SANDS AND CLAYS. From observations in the entries at the shaft of the San Carlos CoalCompany and in mine No. 4, it was ascertained that the clays andsandstones, which are yellowish on the surface, are of bluish colorbefore exposure to the influence of weathering. SAN CARLOS AND ARROYO ABOVE. Near the store at San Carlos (field No. 290) were collected Placenti-ccrn
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