102 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



fossil remains are few, but adjacent to it they abound and are well pre- 

 served. Owing to the fact that the formation here lies comformably 

 upon the Montpelier beds, and that they have strong lithologic resem- 

 blance to it, it is difficult always to distinguish them. At Little Bay 

 the fossils especially abound, and include numerous teeth of sharks. 

 Thanks to Professor Duerden, of the Institute of Jamaica, we have 

 Brown's collections from these localities in Washington, and they 

 correspond perfectly with those made west of Falmouth on the north 

 coast. 



The marls and limestones of the Falmouth formation are consolidated 

 sea mud, consisting of material exactly similar to the so called shell and 

 coral sand which frequently makes the present sea border around 

 Jamaica. It is entirely distinct from true reef rock, for it is not original 

 reef material at all, although much of it may have been derived from 

 reef debris. It is littoral organic oceanic debris which has been de- 

 posited around the perimeter of the island, along borders free from land 

 sediment or in lagoons between the reefs and the land. 



In age the Falmouth formation is newer than the older or highest 

 elevated reefs, and probably synchronous with the middle and lower 

 Soboruco ; hence it must be assigned, like them, to the Pleistocene or 

 a later epoch. 



Miscellaneous Pleistocene and Recent Formations. — In addition to 

 the old Kingston formation and kindred deposits in the interior valleys, 

 there are many aggradational formations of more recent origin, around 

 the margin of the island, occurring as alluvial streamway deposits dis- 

 gorged along the coast, or gravel beds resulting from tlie undermining 

 of the Ilichmond formation where it approaches the sea. The gravel 

 of this material is mostly of the Blue Mountain Series, but it also 

 contains pieces of various other formations. 



The Montego Formation. 



At numerous places around Jamaica are patches of swamp or morass 

 adjacent to the sea and almost level with it. Tliese are usually com- 

 posed of alluvium brought down by the rivers, and are more recent than 

 the Kingston formation previously described. They are well shown 

 along tlic immediate coast at the mouth of IMontego and Retirement 

 Kivcrs south of Montego Bay town and thence around the coast, pro- 

 ceeding eastward, as follows : near "Montego Bay town and Umbrella 

 Point, St. James Parish ; Half-Moon Bay, Trelawney Parish ; Palmetto 

 Point, district of St. George in Portland Parish; between Plantain 



