84 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
nature. Probably the Buff Bay, May Pen, and Porus formations, next 
to be described, are allied and synchronous deposits. 
The Buff Bay Beds. — A formation closely allied to the Bowden beds 
is exposed in the superb coast bluff one mile east of Buff Bay on the 
north side. A good view of this is given in Plate XXVII. and the 
stratigraphical relations shown in Figure 23. This exposure consists of 
over 100 feet of bluish white, earthy, semi-indurated marl, containing 
very finely worn pebbles of igneous rock scarcely as large as peas, 
sparsely disseminated through it. It is in evenly bedded strata some- 
times separated by thin lamine of bluish calcareous clay. The beds 
contain many fossils, most of which crumble into calcareous powder on 
exposure to air, but some are sufficiently preserved to enable Vaughan 
to identify the corals. These beds at Buff Bay rest directly upon a pure 
white chalky marl, which in its lower part. grades down into the Mont- 
pelier beds seen at the railway tunnel. 
The beds of this locality are slightly more calcareous, but neverthe- 
less are texturally related to the marl exposed at Bowden; they like- 
wise contain gravel in very finely rolled particles, possibly indicating 
that the beds are a slightly deeper water stage than those exposed at 
Bowden. Probably the Bowden exposures represent the littoral of the 
formation, while those of Buff Bay are of slightly deeper water origin. 
The identity of the two localities is proved by the fact that one of 
the typical and peculiar fossil corals of Bowden occurs in the Buff Bay 
material as determined by Vaughan. 
At Navy Island, a detached portion of the mainland lying off Port 
Antonio, there are impure yellowish clay marls and thinly bedded lime- 
stones. These are also seen on the point of mainland at Port Antonio 
on which the hotel of the Boston Fruit Company is situated. The 
beds at Navy Island have also been correlated with the Bowden beds 
by Duncan and Wall.! 
The May Pen Beds. — At May Pen Parish of Clarendon, on the 
Montego Bay Railway, and extending from there westward to Clarendon 
Park and eastward to near Old Harbor, along an east and west line 
corresponding with the width of the parish of Clarendon, there out 
crops a peculiar formation corresponding in general position to the 
Bowden beds of the east end. This material consists of a loosely com 
solidated mixture of yellow colored limestone lumps and clay marl, and 
contains many casts of Mollusca, The only good exposures we have 
seen are in the railway cuttings. Tho beds at May Pen clearly rest 
1 Quart. Jour. Geol. Soc., Vol. XXI. p. 14. 
