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pg 005: Reconnaissance in the Rio Grande coal fields of Texas Publication 5040853

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CONTENTS.

Page. Letter of transmittal 9 Introduction 11 I.-EAGLE PASS AND EOCENE COAL FIELDS OF THE MIDDLE RIO GRANDE REGION. Definition of area 13 General physical features 13 Descriptive geology 15 Cretaceous 15 Rio Grande section 15 Lower Cretaceous (Comanche series) 16 Edwards limestone 16 Fort Worth limestone 16 Del Rio clays 17 Buda limestone 18 Upper Cretaceous 18 Dakota division (absent) 18 Eagle Ford formation 18 Austin chalk 19 Upson clays 20 Eagle Pass formation 21 San Miguel beds 21 Coal series 22 Escondido beds 26 Resume of characters and thickness of the Eagle Pass formation 28 Reconnaissance from Cline, Uvalde County, to Eagle Pass 28 Reconnaissance from Eagle Pass to Carrizo Springs 30 Studies along Turkey Creek and the Nueces River, the Frio and Sabinal rivers, Brackett and Uvalde quadrangles (eastern Kinney County and Uvalde County) 31 Anacacho formation 31 Eagle Pass formation in Brackett and Uvalde quadrangles 33 Variations in character of the formations in the different sections 34 Anacacho formation and Upson clays 34 Eagle Pass formation 35 Relation of the Cretaceous to the Eocene 35 Rio Grande section 35 Between Eagle Pass and Carrizo Springs 35 Along the Nueces River 36 Along the Frio River 36 Tertiary 37 Eocene 37 Rio Grande section 37 Reconnaissance between Eagle Pass and Carrizo Springs and southwest of Carrizo Springs 46