664 BROWN AND O'CONNELL THE JURASSIC OF CUBA 



mum transgression in late Portlandian time, passed through the eastern 

 end of the Province of Pinar del Rio. No Jurassic strata have been 

 found farther east, and we may feel certain that they were not deposited, 

 since Cretaceous beds rest directly upon the old folded schists. 



The submergence which had already been in progress throughout 

 Meso- and Neo-Jurassic time continued during the Cretaceous. At the 

 end of the Mesozoic the sea retreated, and there ensued a long period of 

 elevation, folding, and erosion lasting through Paleocene and most of 

 Eocene time. During the remainder of the Tertiary era Cuba was more 

 or less covered by the sea, the submergence being greater over the eastern 

 than the western end. 



