HILL: GEOLOGY OF JAMAICA. 177 
beds, which coincides in character with the Richmond formation of 
Jamaica. 
The wide extent in latest Cretaceous and Eocene time of these impure 
Shallow water land-derived deposits, so alike in sedimentary character, 
18 an evidence of changes of level during these epochs when rapid 
erosion and deposition were going on. Around the continental margins, 
except in Panama, the source of the material can be traced to an adja- 
“ent back land, but all geologic record of the lands whence the Antillean 
deposits came are destroyed. 
There is also evidence of wide occurrence in the Antilles of strati- 
Sraphie horizons corresponding to the Cambridge beds of Jamaica, mark- 
Ing the rapid transition from the underlying land-derived shales into the 
Overlying Oceanic White Limestone deposits of the Montpelier type and 
Characterized by its peculiar invertebrate fauna. 
In the islands of Anguilla and St, Bartholomew the shales and con- 
Blomeratos allied to the Richmond are overlain by or intercalated with 
Imestones and marl beds. The faunas of the two islands, as reported by 
Cleve, are somewhat different. The fossils of these probable Eocene 
horizons from Anguilla, as enumerated by Cleve, consist of many species 
at Molluscan genera, only one of which, Natica phasianelloides, W. J. G., 
'S also reported from the Richmond beds of Jamaica. These Anguilla 
eds were originally referred to the Miocene by Guppy.? Following the 
latter author, Cleve, in describing the fossils, referred them to the 
iocene. This conclusion was fortified by the identity of the fossils 
Characteristic of the San Fernando beds of Trinidad, which Guppy at 
that time also considered Miocene. Guppy in his latest papers has 
IMferred the San Fernando beds, together with those of Anguilla,® to the 
"cene, and the latter age must now be aecepted for the Anguilla beds, 
Which are worthy of further investigation. 
In St. Bartholomew certain beds roferred to the Eocene by Cleve * 
and Guppy * have a most decided Cambridge aspect. Nearly every fos- 
" genus mentioned from them is identical with those found in the 
Ambridge and Catadupa beds, including the peculiar gigantic Cerithium, 
. rebratula, and the Echinoderms Macropneustes and Echinolampus, — 
Sera which were found by me in the Cambridge beds of Jamaica. 
Op. eit., pp. 22-26. 
Quart. Jour. Geol. Soc. London, 1866, Vol. XXII. p. 297. 
Geol. Magazine, London, September-October, 1874, p. 2. 
Op. cit., p. 44. 
5 Geol. Magazine, London, September-October, 1874, p. 2. 
VOL. XXXIV. 12 
» on - 
i 
| 
1 
| 
