ANTILLEAN-CARIBBEAN REGION 



877 



<s^ 



-J 



NAUTICAL MILES 



CENOZOIC SEDIMENT- ! • ! > 

 ARY ROCKS 



QUARTZ DIORITE, CRETACEOUS 



BASAL COMPLEX. METAMORPHIC 

 AND IGNEOUS ROCKS 



Fig. 42.5. Simplified geologic and terrane map of Hispaniola (Haiti on west and Dominican Republic on 

 east). Geology after Butterlin (1956) and Bowin (unpublished). Terrane from USAF Aeronautical charts. 

 Cretaceous rocks considered mostly Upper Cretaceous by Bowin. 



Cordillera Central. They are intruded by hornblende tonalite plutons, at least 

 one of which is of batholithic dimensions. Several plutons and batholiths of 

 hornblende tonalite intrude the metamorphics along the northern flank of the 

 Cordillera Central. The hornblende tonalites are probably all of one general 

 period of intrusion. Cobbles of hornblende tonalite are found in uppermost 

 Upper Eocene conglomerate a short distance north of the Cordillera Central. 

 Thus the hornblende tonalites are considered to be of post-Campanian, pre- 



Oligocene age. They are probably related to the strong late Eocene deformation 

 that thrust the metamorphic belt northeastward over unmetamorphosed, dated. 

 Lower Cretaceous to Middle Eocene, volcanic and limestone rocks. 



The unmetamorphosed rocks lying to the northeast of the overthrust meta- 

 morphic belt in central Dominican Republic consists of Lower Cretaceous vol- 

 canic rocks overlain by Lower Cretaceous limestone. The Lower Cretaceous 

 section is unconformably overlain by Upper Cretaceous limestone followed 



