GEOLOGICAL RECONNAISSANCE OF THE DOMINICAN REPUBLIC. 



A specimen (R 2, 3) of pale drab limestone collected in the Province of 

 Puerto Plata contains fragments of green decomposed lava whose sharp 

 angularity indicates that they were not carried far by currents and that 

 they were erupted while the limestone was being formed. 



A dark-gray calcareous rock from the Constanza-Tubano road, in the 

 Province of La Vega (C 73-19), contains much noncalcareous material that 

 forms a pale rind on its weathered surface. This material may be volcanic, 

 as Dr. Vaughan has suggested, but the suggestion can not be verified with- 

 out microscopic study. This rock probably belongs to the basal complex. 

 Specimens of tuffaceous rocks. 



