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Guppy Reprint 
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Page loS 
Fossils of the Caribean Group. 
? Eozoon caribeum Gupp}’. 
Favosites fenestralis “ 
Pseudocrinites (species like 
Ps. magnificus Forbes). 
Petraia (like P. bina Lonsd). 
The other remains have not been assigned with an)' cer- 
tainty to their generic positions. 
3. The Blue or Compact Limestone. 
The southern borders of the ranges formed b)' 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. Con.sequently we are almo.st 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 lime.stone 
is of a later age ; for while the Caribean Group appears to 
belong to an older paleozoic epoch, the compact limestone 
