HILL: GEOLOGY OF JAMAICA. 181 
the occurrence of the Vummuline as characteristic of the otherwise un- 
fossiliferous lower Miocene and its discovery in Haiti. From his details 
there can be no doubt that the Post-Cretaceous sequence of Haiti and 
Jamaica are identical in lithologic and paleontologic character, consisting 
of Richmond-like shales at the base with Orbitoides passing up into Mont- 
pelier-like limestones with Orbitoides and Nummulites. In the chapter 
on “The Geology of the Monte Cristo Range,” pages 162-173, he shows 
that the Orbitoidal White Limestone, as in Cuba and Jamaica, occurs to 
heights of 2,530 feet. This limestone at Monte Cristo is foraminiferal 
and of great purity, and like the Montpelier of Jamaica does not weather 
into red soils. It is also interesting to note that in San Domingo as 
in Jamaica the Nummuline and Orbitoides occur in the limestone, and 
the latter extends down into the shale. 
Tippenhauer has described the white limestones of Haiti more fully 
than Gabb, but like the latter refers them to a more recent age. Under 
the head of the “ White Limestone” which he says covers five eighths 
of the island, he describes several varieties which perfectly conform with 
the descriptions of the Jamaican rocks. Unfortunately, however, he 
includes the coast limestone or elevated reef rock in this category and 
assigns the whole to the Post-Pliocene, 
Concerning the Haitian Radiolarian beds nothing is known regarding 
their stratigraphy, the material being known commercially only from 
St. Jérémie, From the similarity of geological structure and sequence 
of that end of the island, and in the absence of information to the con- 
trary, we can at least infer that the Radiolarian beds of this locality 
are closely related to those of Cuba and the Montpelier chalks of 
Jamaica, 
The Radiolarian and Globigerina earths of Barbados have been made 
the subject of extensive researches by Jukes-Browne and Harrison,’ 
Gregory,? and others, and the geology of this island has been recently 
thoroughly restudied by the writer, 
The details of this structure are elaborated with great minuteness in 
the publications of Jukes-Browne and Harrison, With the exception 
that they referred the Radiolarian earths and the underlying Scotland 
beds to newer epochs by one stage than that to which I think they 
belong, their reports are in general correct. 
In Trinidad beds of Radiolarian and Globigerina chalks occupy the 
1 Quart. Jour. Geol. Soc. London, 1892, Vol. XL VIII. p. 193. 
2 Paleontology and Physical Geology of the West Indies, Quart. Jour. Geol. 
Soc, London, 1895, Vol. LI. p. 293. 
