HILL: GEOLOGY OF JAMAICA. 141 
their true stratigraphic position in the general section. This material 
and its occurrence as given by him is as follows : — 
l. In a piece of gray flint from the base of the White Limestone at 
St. Thomas, Jamaica. Numerous Orbitoides, mostly O. mantelli, though 
some may be O. dispansus. j 
2. Orbitoidal limestone, Hopewell, Metcalf. Flint with Orbitoides 
and Nummulinæ, Orange River, Metcalf. 
3. Limestone with Operculinee and Nummuline, and the same silici- 
fied, Brimmer Hill, St. Mary. 
4. Flint with Operculine and Nummulinæ, Preston, St. Mary. 
5. Orbitoidal limestone, Carron Hall, St. Mary. 
6. Alveolina limestone, Crofts, Clarendon. 
7. Orbitulina rock, Vere. 
8. A specimen of hard yellowish limestone at Clarendon, largely 
composed of the Heterosteginæ, and further noted in this Part under 
the head of Bowden beds. 
Of the above list Nos. 1, 2, 3, and 4 are undoubtedly from the flint 
and chalk beds of the Montpelier formation ; No. 5 is probably from 
the Cambridge beds; No. 6 from the Moneague ; No. 7 comes most 
Probably from the Cobre limestone overlying the Bowden beds. 
From these collections, 1 to 5 inclusive, he identified O. mantelli, 
mixed with numerous forms referred to O. dispansus and O. fortissii, 
associated with Nummuline, Jones also says! that the “Orbitoides 
mantelli of Morton, of stronger growth than the variety found in 
Jamaica, Antigua, and Malta, characterizes some of the Tertiary beds 
9f Alabama, Nummulites being absent, it is supposed.” ? 
To this statement we might add that O. mantelli is especially 
Characteristic of the Vicksburg horizon of the Upper Eocene (now 
lower Oligocene of Dall) of the Southern United States, and has been 
identified from this horizon by Dall from our collection from the beds. 
of this age in Costa Rica. According to Bagg, O. fortissii, “a typical 
Eocene form,” also occurs in Panama lower down in the Eocene. 
Jones, accepting the current stratigraphic conceptions, was misled 
Into the serious error of concluding that these forms, notwithstanding 
their world-wide habitat, were Miocene in Jamaica. This opinion was 
largely due to the publications of J. Lechemere Guppy. 
Fossils of the Moneague Beds. — The limestones of the Moneague 
beds abound in moulds of Mollusca. Fossils of this character from 
1 Loc. cit., p. 105. 
2 Since discovered by Bagg. Letter to author. 
