HILL: GEOLOGY OF JAMAICA. 101 
The Falmouth Formation. 
On the coast of Trelawney, Hanover, and Westmoreland, immediately 
adjacent to the sea and seldom rising more than 15 feet above it, there 
is a formation of white chalky marl, usually friable but frequently in- 
durated. In this are preserved numerous mollusks and fragments of 
reef building corals. The fossils retain all the nacre and other charac- 
teristics of living species, and have been pronounced by Dall to be of 
Post-Pliocene age. This formation indurates in places into a close 
textured chalky white limestone, superficially indistinguishable from 
Many beds of the Oceanic Series, but on close examination it can always 
be distinguished by the numerous fossils, as well as by its entirely 
different microscopic structure, which shows it to be old beach marl. 
Among the numerous fossils are many species still living in the adjacent 
Waters, including Strombide and a small Bulla, the latter being the 
Same which is common in the limestone of Yucatan, the island of 
B 
important, because it has wide occurrence throughout Tropical America, 
and, when properly studied, will assist in general correlation. 
arbuda, and other localities in the West Indies. This formation is 
, 
An outerop of white limestone, similar to the Falmouth formation, 
Occurs at Hospital Point, north of Montego Bay. This contains the 
remains of large Strombide, and other well known Species living in 
the present sen. Fragments of coral heads of the reef building species 
are quite common in this material. Good collections of the fossils of 
the Falmouth formation were also made near Landovary about seven 
Miles west of St^ Ann. These consisted of many molluscan species 
Associated with single heads of reef coral. The formation here is so 
Mdurated that it might well be termed white limestone, and easily 
confused with the white limestones of the Oceanic Series. In St. 
Sorge and Metcalfe the formation consists of almost horizontal beds of 
White marl with the mangrove oyster, between Canewood and Spanish 
iver, and from Low Layton to Retreat and Savanna Point. 
The Falmouth formation was nowhere seen to be more than half a 
mile wide on the north coast, but on the southern coast of Westmore- 
and, back of Savanna-la-Mar, it indents the country for a considerable 
Istance, Its occurrence at this locality has been well described by 
"Own under the name of “White Marl" ! and “Bulla Limestone.” 2 
Tere it consists chiefly of a soft white lime marl, usually bedded, and 
Wing some layers more eroded than others. Back from the coast the 
1 Jamaican Reports, pp. 229, 230, 2 Tbid., pp. 228, 229, 
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