Mr. De la Beche on the Geology of Jamaica. 177 



Moneague. Tliis parish affords many good sections, among which may be 

 mentioned the cliffs between Ocho Rios Bay and the Roaring River*. 



The St. Ann's Hmestone is continued into St. Mary's and St. Thomas-in- 

 the-Vale ; the space that it occupies will be best seen by reference to the 

 map. In the former parish, besides the component parts of this formation 

 which have been above enumerated, the shores present us with a rock com- 

 posed of either white or flesh-coloured limestone, mixed with marl and con- 

 taining an abundance of corals intermingled with shells ; the former when 

 broken having almost the appearance of recent specimens. I could not per- 

 ceive that these beds were separated in any marked manner from the other 

 white limestones, which they resemble in mineralogical composition : on the 

 contrary, they seem to pass into them, and to form the upper part of the great 

 white limestone formation of Jamaica. 



These beds are observable on the coast in the vicinity of Ora Cabessa Bay, 

 and constitute the point upon which Fort Haldane stands, the island opposite 

 Port Maria, Pagee Point, and several small patches on the coast from the 

 latter place to Forster's Cove, where the points on both sides are formed of 

 them. They here dip at about 25° or 30° to the N,, and are separated from 

 the grauwacke by thick conglomerate beds, which also have the same dip : on 

 the road up to a house on tlie western side of the cove, the corals are beauti- 

 fully exposed. These beds are also found at Blowing Point, Don Christo- 

 pher's Point, and in the vicinity of Jack's Bay : at the former places they are 

 generally white and compact, sometimes of a flesh-colour, and do not contain 

 so many corals as at the latter place, where the limestone forms a rising- 

 ground some little distance into the interior. 



Between Palmetto Grove (St. Mary's) and Pimento Grove, and to the north 

 of the trap rocks of the latter place, the lower marls of the white limestone 

 formation are seen, containing some beds of compact grayish blue limestone. 

 The high hill between Palmetto Grove and Tremolesworth also exposes the 

 lower members of this formation, in which the marls are abundant. The con- 

 tinuation of this hill running to the N.W. appears formed of the same rocks. 



* The falls of this river are extremely beautiful. The quantity of water must sometimes be 

 considerable, and is most probably collected in the high lands by numerous sink-holes, which 

 afterwards unite in one cavity, through which the waters find their way to the surface at a lower 

 level. After taking a considerable leap over a face of rock the river rushes through woods, and 

 becomes divided into many branches producing a singular effect as they form cascades among 

 the trees, which even in some places rise out of the channel itself, without being overthrown by 

 the force of the water : this would seem in some measure attributable to the quantity of carbonate 

 of lime that the waters deposit upon the roots and fallen pieces, which are thus firmly cemented 

 together. 



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