229 



Guppy Reprint 



81 



Page 10S 



Fossils of the Caribean Group. 



? Eozoon caribeum Guppy. 

 Favosites fenestralis 



Pseudocrinites (species like 

 Ps. magnificus Forbes). 



Petraia (like P. bina Lonsd). 



The other remains have not been assigned with an} 7 cer- 

 tainty to their generic positions. 



The southern borders of the ranges formed by the Caribean 

 Group are fringed here and there by low hills chiefly of 

 limestone, with occasional interstratified beds of clay-slate 

 and shale, lying unconformably upon the micaschists and 

 clayslates, which constitute the larger elevations. This 

 compact dark-blue limestone, often nearly black, contains 

 abundant fossils, but in so metamorphosed a state as to be 

 generally irrecognizable. We find in some beds what 

 appears to be a mass of serpuline remains, occasionally small 

 univalves show themselves, and rarely a few distinct corals. 

 But the rock is so hard, and the structure of the fossils so 

 altered, as to make it next "to impossible to extract any of 

 these organic remains in a state which might admit of study 

 or identification. Consequently we are almost as much in 

 the dark as ever as to the age of these rocks. One impor- 

 tant conclusion, however, has been gradually forcing itself 

 upon my mind, which is that the compact blue limestone of 

 Gaspari, Pointe Gourde, the Cotoras, and Laventille does not 

 belong to the same formation as the mica and talc schists 

 and sandstones, the clayslate, quartzite and crystalline 

 limestones of the Caribean group. The compact limestone 

 is of a later age ; for while the Caribean Group appears to 

 belong to an older paleozoic epoch, the compact limestone 



3. The Blue or Compact Limestone. 



