Vol. 67.] OF ANTIGUA AND OTHER WEST INDIAN ISLANDS. 



"S ,3 



U 



mi 



O// 



Series is not, therefore, a 



fauna. But I have assumed them to 

 be older than the Tamana and St. 

 Croix Beds. In any case, I have 

 little doubt of the Miocene age of 

 the latter ; while the lowest beds of 

 the Naparima Series, namely the Or- 

 bi to ides Bed and the Leda and Nucula 

 Beds, are Eocene, and pass down to 

 the Cretaceous. However, in his paper 

 on the ' Older Tertiary Formations of 

 the West Indian Islands ' l Duncan 

 admits the Eocene age of these beds. 



By the kindness of the Directors of 

 the Marbela Manjak Mines (Mr. James 

 Wilson and Mr. Bernstein) and of the 

 Engineer of the mines (Mr. Raspass), 

 I have received samples of the rocks 

 passed through in sinking the shafts 

 and adits of the mines, as well as 

 other information. I published a first 

 note on this in the ' Geological Maga- 

 zine ' for 1904 (dec. v, vol. i, p. 276) ; 

 but this was extremely imperfect, and 

 the subsequent information which I 

 acquired caused me to publish a second 

 note : this appeared in the Bulletin of 

 the Agricultural Department of Trini- 

 dad. A wider publicity would have 

 been desirable, but I was not able to 

 secure it. I sent, however, copies to 

 all persons and institutions that seemed 

 likely to care for them. In this second 

 note I announced the discovery of the 

 Orbitoides Bed at a depth of 200 feet, 

 underlying the manjak-bearing strata. 

 I farther discussed the characters of 

 the Orbitoides and their distribution, 

 and the origin of the manjak. The 

 manjak mines are situated within the 

 area coloured as belonging to the 

 Xariva Series in the map attached 

 to the Geological Report on Trinidad 

 (1860). The strata passed through in 

 sinking the mines represent the equi- 

 valents in time of the whole Naparima 

 Series, extending downwards from the 

 Miocene inclusive to the Eocene and 

 top of the Cretaceous. The Xariva 

 separate formation, but a part of the 



1 Q. J. Q. S, vol. xxix (1873) p. 549. 



