GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 545 



Pliocene — Continued. 



continuous westward into Costa Rica, except near the 

 mouths of large river valleys where it has been removed or 

 covered with alluvium. This coquina formation is clearly 

 older than the marine Pleistocene (5850), occupying a level 

 slightly above that of the sea, in the vicinity of Mindi, 

 Mount Hope, and around the margins of Limon Bay. 

 From the general stratigraphic relations of this rock I am 

 inclined to consider it not younger than Pliocene. 



Section one-third of a mile south of the southern end of Toro 

 Point Breakwater, in quarry. 



Feet thick. 



6037. Gray coquina rock mixed with local layers and lenses 



of sand 35^to 40 



Barnacle plates, echinoid spines, fragments of oyster shells, 



and a large Scala (Epitonium toroense Ball) are abundant. 



Specimens of the last named form were the only perfect 



fossils found. 



