GEOLEX

Summary of Citation: Sanchez

Publication:
Patterson, J.M., 1942, Stratigraphy of Eocene between Laredo
   and Rio Grande City, Texas: American Association of Petroleum
   Geologists Bulletin, v. 26, no. 2, p. 256-274

Usage in Publication:
Sanchez sandstone tongue

Modifications:	Geologic Province:	Dominant Lithology:
Overview Areal limits	Gulf Coast basin

Summary:
Is sandstone tongue (member) in upper part of Fayette formation in Starr and southern Zapata Cos, TX (Gulf Coast basin). "The Gorgora shales are overlain in Starr County by approximately 100 feet of marine sandstone beds. These beds have been given the name Sanchez by Kane and Gierhart (1935). North of Starr County this sandstone member gradually decreases in thickness and finally dies out before it gets half way across Zapata County. This is a marine sandstone formation containing CORBULA, VENERICARDIA, gastropods and other shells as well as the marine sandstone indicator HALYMENITES." Overlies Gorgora shale member (new) of the Fayette; underlies the Agua Verde shale member (new) of the Fayette. Assigned to the Eocene. Cross section from Laredo to Rio Grande City (fig 2). Locality map.