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BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



without presentation of proof by previous writers, whose conchisions, as 

 stated in tlie Introduction to this work, are known to have been based 

 on the erroneous correlation of tliese beds with the Cambridge Yellow 

 limestones wdiich we know underlie the white limestones as a whole. 

 That they lie entirely above the vast thicknesses of white limestone in- 

 cluded in the Montpelier, Moneague, and Cobre formations is certain, 

 and we have no reason to believe that any great mass of white lime- 

 stones succeed them, the white limestones of the later formations being 

 relatively trivial in comparative thickness. 



The Coastal Series. — Later Portion. 



The Manchioneal Formation. — On the abrupt east coast of tl.e 

 island, notably at Mulatto Bay and Manchioneal, and at various locali- 

 ties between those points, there is a marine formation composed of 

 alternations of loose yellow marl and lumpy white limestone slightly 

 resembling the May Pen beds, but differing in that it possesses in places 

 well defined bedding planes and sometimes alternations of evenly bedded 

 marl and impure limestones. 



Figure 27. Exposure of Pliocene at Mulatto River with Ceral Heads. 



East of Pellew Bay are exposed 200 feet of a formation consisting of 

 rotten and honeycombed white lime boulders, embedded in white marl 

 which weathers exteriorly into yellow clay. Against the eroded sides of 

 this is an unconformable deposit of elevated reef rock. 



At Mulatto River the road cuts through superb exposures, showing 

 200 feet of beds similar to the foregoing, except that the limestone and 

 marl aro in persistent uniform alternations dipping strongly to the 

 north. In these beds maybe seen occasional heads of reef coral. About 

 the middle of tlic section there is a ten foot stratum almost made up 

 of the latter, which clearly represents old reef rock, the oldest thus far 

 encountered in the ascending series of the Jamaican section. The 

 accompanying figure will give an idea of these beds. 



