GEOLOGY OF THE PROVINCES OF BARAHONA AND AZUA. 



199 



GEOLOGY. 



STRATIGRAPHY. 



The following table shows in a general way the character and sequence 

 of the sedimentary rocks in the Provinces of Barahona and Azua. 



Generalized straligraphic table. 



PRE-TERTIARY ROCKS. 



Rocks of pre-Tertiary age are known only in the northern and eastern 

 parts of the provinces. They consist of metamorphosed sandstone, shale, 

 limestone and both effusive and intrusive igneous rocks. The ages and 

 interrelations of these rocks have not been accurately determined. Some 

 are probably Cretaceous, but others may be even older. Like most of the 

 rocks of the basal complex they have been folded and faulted and have 

 undergone so much contact and dynamic metamorphism that their com- 

 plexity can not be unravelled without long and careful work in the field and 

 laboratory. 



TERTIARY SEDIMENTARY ROCKS. 

 Eocene. 

 Rock of Eocene age was identified at three localities in Azua Province, 

 as follows: Station 8562, foraminiferal limestone in gravel on the road at a 

 place halfway between Banica and Las Matas; station 8608, rubble on the 

 side of the road from Tubano to Las Yayas, north of Arroyo Salado, near 

 Higuero Largo, altitude about 500 meters; station 8644, rubble from 

 Higuerito. Rock of the same age was identified at several places in the 



