GEOLOGY OF THE PROVINCES OF BARAHONA AND AZUA. 221 



indication of bedding was observed. As the investigation was not carried 

 farther south, no data as to the probable thickness of this formation were 

 obtained. The Foraminifera collected include Nummulites and other 

 forms of Eocene age (stations 8626, 8627; lists of fossils on p. 106). 



The following generalized section summarizes the stratigraphy of the 

 northern part of Sierra Bahoruco. It is based on a hasty reconnaissance 

 examination, and the thicknesses given are therefore only approximate, 

 but the general relations are believed to be correctly shown. 

 Generalized section in Sierra Bahoruco south of Duvergi. 



Pleistocene: Thickness 



in meters. 

 Coral limestone and limestone conglomerate, forming ter- 

 race deposits near the border of Lake Enriquillo 12 



Unconformity. 

 Miocene (?) : 



Conglomerate, variegated clay, and clayey sandstone; 



probably some limestone 50-75 



Unconformity ? 



Early Miocene or late Oligocene: 



Rudely bedded marly limestone, with interbedded lime- 

 stone conglomerate; fossiliferous, especially in the lower 



part, but the fossils are poorly preserved 300-500 



Thin-bedded impure limestone; few fossils 100 



Brick red, and yellow tuffaceous claystone and con- 

 glomerate; no fossils observed 130 



Rudely bedded sandy limestone; no fossils observed 300-500 



Basal conglomerate composed of pebbles of foraminiferal 



limestone 230 



Unconformity. 

 Eocene: 



Hard semicrystalline limestone with Foraminifera Not known. 



BARAHONA-BAHORUCO COAST. 



The village of Barahona stands on a terrace of "coast limestone" which 

 extends from the beach inland for a few kilometers. South of Barahona, 

 along the coast, this limestone forms a sea cliff, 15 to 20 meters high, the 

 top of which is a narrow terrace strewn with modern shells. Back of this 

 terrace is a higher one at an altitude of about 50 meters, consisting of 

 coarse limestone rubble derived from the mountains in the rear. The 

 "coast limestone" throughout this area is made up chiefly of firmly 

 cemented limestone conglomerate containing a few corals. In the southern 

 part of this area, beyond Rio Bahoruco, the adjacent mountains consist in 

 part of basaltic flows and the conglomerate contains pebbles of basalt. 

 About 5 kilometers south of Rio Bahoruco is El Derrumbado, a precipitous 

 promontory of limestone that rises about 500 meters above the sea. This 

 limestone probably rests in fault contact against the basalt, extending 

 from this point northward to the vicinity of Rio Bahoruco. 



