CONTENTS. 7 



PAGE. 

 Chapter IX. Geology of the provinces of Barahona and Azua, by D. Dale Condit 

 and Clyde P. Ross — Continued. 

 Geology — Continued. 



Igneous rocks 202 



Geologic structure 203 



Areal geology 203 



General features 203 



The Cordillera Central 204 



Rio Yaque Valley 206 



San Juan Valley 209 



General features 209 



Local details 210 



Area east of Rio Yaque del Sur 212 



Enriquillo Basin 213 



Outline of geology 213 



Vicinity of Barbacoa and eastward 214 



Cerros de Sal 214 



The salt deposits 215 



Petroleum possibilities in Enriquillo Basin 219 



Sierra Bahoruco south of Duverge 219 



Barahona-Bahoruco coast 221 



Azua and vicinity 222 



Outline of geology 222 



The Azua oil field 223 



General features , 223 



History of development 224 



Quality of oil 224 



Reported oil seepages east of Azua 225 



Summary of economic geology 226 



Oil and gas • 226 



Salines 227 



Gypsum 227 



Metalliferous deposits 227 



Chapter X. Economic geology, by D. Dale Condit and Clyde P. Ross 228 



Mining concessions in force in July, 1919 228 



Mineral deposits near Hatillo and Maim6n, province of La Vega 228 



Magnetite deposits near Hatillo 229 



Copper deposits near Hatillo 230 



The Maim6n iron deposits 231 



La Perseverancia nickel deposit, province of Santo Domingo 231 



History of concessions 231 



Geography 232 



Geology 232 



Mining operations 233 



Mode of occurrence of nickel 233 



Results of sampling 234 



Conclusions 235 



The San Crist6bal mining district, province of Santo Domingo 236 



Location and access 236 



