hill: geology of Jamaica. 1 



o'y 



0. mantelli as that so abundant in the Antiguan flint." He also states ^ 

 that " the Orbitoides are similar to those found fossil in the Upper 

 Chalk of Southern France and the Pyrenees, and in the Nummulites 

 beds of Scinde." 



The corals identified by Vaughan are species not hitherto found in 

 Jamaica, and constitute a valuable addition to its fauna, inasmuch as 

 they fix the Eocene position of these beds beyond doubt. He submits 

 the following notes. 



"The Cambridge beds can be referred to the Eocene (or possibly Oli- 

 gocene) on the strength of their containing abundant specimens of 

 Dendracis. This genus is not known from rocks older than Eocene or 

 younger than Oligocene. Both specimens and species are abundant in 

 Southern Europe and Northern Africa in strata of these ages. 



"The Catadupa beds also appear to be Eocene on the evidence of 

 the Trochosmilia, which has a near European relative in T. acutimargo, 

 Reuss. The Diploria also has a European analogue. Trochoseris is a 

 doubtfully Cretaceous genus; it occurs in the Eocene, and there is a 

 recent species. 



" The faunas from the Richmond, Cambridge, and Catadupa beds seem 

 quite different from the St. Bartholomew fauna, described by Duncan. 

 Apparently they possess only one species in common, viz. the Stylo- 

 coeniaf identified by Duncan as emarciata. The stratigraphic affinities 

 of the Jamaican species for European species are the same as those of 

 the St. Bartholomew corals, and I believe more extensive study and 

 collecting will show considerable resemblance, — especially after a re- 

 vision of Duncan's types from St. Bartholomew." 



Concerning the eight species found by Vaughan, he says that " there 

 is not a strictly Cretaceous form in the collection from Catadupa and 

 Cambridge, ... so the corals have afforded no evidence tending to prove 

 the Cretaceous age of these beds, but it all, so far as it is definite, points 

 to an Eocene age." They too occurred in muddy waters, but more 

 calcareous than those of the Richmond epoch, and are accompanied by a 

 large molluscan fauna. 



The two or three genera and species of Echinodermata submitted to 

 Agassiz were reported by him to be Tertiary forms. 



The mollusca of the Cambridge beds, while few in species, as a rule 

 are sufficiently abundant and well preserved to present a distinct faunal 

 aspect. Fortunately these have escaped the non-resident species makers, 

 who have thrown all other Post-Cretaceous Jamaican fossils into the 



1 Quart. Jour. Geol. Soc. London, 1863, Vol. XIX. p. 514. 



