PROCEEDINGS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES 



Fourth Series 



Vol. V, No. 6, pp. 163-193, Plates 16-19. December 31, 1915 



VI 

 TERTIARY DEPOSITS OF NORTHEASTERN MEXICO 



E. T. DUMBLE 



Chief Geologist Southern Pacific Company 



Page 



INTRODUCTION 165 



THE AREA 166 



PHYSIOGRAPHY 167 



CRETACEOUS FLOOR 169 



EscoNDiDO Beds 169 



Papagallos Shale 170 



San Juan Limestone —.. 170 



CRETACEOUS TERTIARY CONTACT _ 171 



THE TERTIARIES 176 



Midway 176 



Wilcox 176 



Claiborne 177 



Carrizo Sands * 177 



Marine Beds 177 



Yegua 177 



Fayette 178 



Frio 178 



AREAL DISTRIBUTION OF THE TERTIARIES 178 



Midway and Wilcox '. 178 



Claiborne 181 



Carrizo 181 



Marine : 182 



Yegua 183 



Fayette 184 



Frio 186 



Upper Eocene 188 



Oligocene 189 



Neocene ■. 192 



Coquina Limestone 192 



Reynosa 193 



December 31, 1915. 



