84 bulletin: museum of comparative zoology. 



nature. Probably the Buff Bay, May Pen, and Porus foruiations, 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 XXYII. and the 

 strntigraphical relations shown in Pigure 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 laminse 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 Vaughau 

 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 ^lay Pen Parish of Clarendon, on the 

 Montego l>ay 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 cast end. This material consists of a loosely con- 

 solidated mixture of yellow colored limestone lumps and clay marl, and 

 contains many casts of M(^llusca. Tiie only good exposures we have 

 seen are in the railway cuttings. The beds at May Pen clearly rest 



1 Quart. Jour. Geol. Soc, Vol. XXI. p. 14. 



