HILL: GEOLOGY OF JAMAICA. "t 
usually grass-covered and not retaken by shrubs and trees, as in the 
case of the abandoned soils of other formations. 
William Hill has made microscopic examinations of a rock from Mile 
Gully near Kendall in the centre of the island, 1,100 feet above the sea, 
which apparently belongs to the Brownstown formation. The nature of 
this material, as described by him, is as follows: “Mile Gully, speci- 
mon 1. Angular fragments set in a matrix of what was in all probability 
fine mud, but now granular calcite, The structure of the fragments 
and mud is obliterated by general crystallization, Mile Gully No. 2. 
Made up originally of large fragments set in matrix of fine mud. 
Structure of fragments mostly lost, outline shown by patches of crystal- 
line calcite, Fragments of Lithothamnion and fragments. of probably 
Amphistegina. Contains also ossicles of a recent starfish, Mile Gully 
No. 3. Patches of clear érystalline calcite in a matrix of granular cal- 
cite. One or two fragments can be seen to be Echinoid plates or 
ossicles,” 
Jukes-Browne and Harrison state that these specimens from Man- 
chester and St. Elizabeth were found to resemble coral limestones,” and 
Hill also compares them * 
scriptions we do not see the resemblance, — especially to rocks of 
to rocks of this origin, but from these de- 
reef origin or reef débris. 
From their usual association with and occurrence above the Montpelier 
beds, there is little doubt that they were continuously deposited with 
the latter, and possibly may represent shallowing but nevertheless deep 
water beds after the culmination of the Montpelier subsidence. Our 
knowledge of the upper contact of these beds is very deficient. In 
Clarendon and St. Elizabeth they clearly occur below the Cobre and 
Porus (Bowden) formations. 
These beds occur at many places in the western half of the island, 
especially in the vicinity of Brownstown and Retreat, St. Ann Parish. 
At these localities, as in Trelawney, St. James, Hanover, and Westmore- 
land, they occupy the highlands of tho interior, constituting the surface 
formation out of which the cockpit country is largely eroded. Beds of 
allied lithologie character are exposed at Moneague in the excellent cut- 
tings along the Montego Bay between Ipswich and Catadupa; at Retreat, 
Trelawney Parish ; at Cinnamon Hill, St. James Parish ; on the north 
Coast road, and in the bluffs at the railway station at Ewarton. 
1 Quart. Jour, Geol. Soc. London, 1891, Vol. XLII. pp. 248, 249. 
2 Ibid., Vol. XLVIII. p. 219. 
3 Ibid, Vol. XLVII. p. 248. 
