1897-98]- LATE FORMATIONS AND GREAT CHANGES OF LEVEL IN JAMAICA. 341 



value. At this locality the following modern species were found by 

 the writer, and kindly determined by Mr. Charles T. Simpson : — 



Cardium serratum (L.) Area Sp. 



" laevig-atuin (L.) Tellina fausta (Don.) 



" muricatum (L. ) Zoripes edentula (L.) 



" sp. Levona pica (Gm.) 



Lutricola iiiterstriata (Say.) Strombus gfig-as. 



Corals were not determined. 



Near Orange Cove, west of Lucea Bay, resting on an eroded ridge of 

 White Limestone, only 300 feet wide, there is a deposit of gravel with 

 small boulders of ten inches diameter, with marl above, the same as at 

 Hopewell. 



On Mrs. Roger's hill at Lucea Bay, at an elevation of 80 feet above 

 the sea, resting on the eroded shales, for all of the White Limestones 

 had here been removed, there is a deposit of from four to eight feet of 

 marl resembling the Layton series of the region, in being subsequently 

 greatly eroded and in containing small water-worn pebbles, but as no 

 overlying formation was seen it cannot positively be asserted to be the 

 equivalent although resting on the denuded old foundation. From it 

 the following fossils were obtained, and Mr. Simpson also kindly 

 determined them : — 



Strombus pug-ilis (L. ) Turbo castineus. 



Pecten nucleus (?), (B.) Pleurodonta janiaicensis. 



Area noae. Cardium laevigfatum (L.). 



Lucinea jamaicensis. Venus cancellata (L. ) 



Area (like) lienosa (perhaps extinct). Pleurodonta lucrina (Muel), var. 

 " jamaicensis (Gm.) towards acuta. 



From the paleontological standpoint, all of the fossils from the series, 

 such as are probably the equivalent of the Layton beds, belong to 

 modern species, but the enormous amount of denudation and other 

 changes which have occurred since their deposition places the forma- 

 tion a considerable length of time ago. 



Of the Jamaican geologists, Mr. C. B. Brown* seemed to most nearly 

 appreciate the importance of the later deposits. He describes extensive 

 beds of marl, of a mechanical origin derived from the White Limestones, 

 as covering considerable areas in southwestern Jamaica, and in many 

 places he notes the scarcity of fossils, but nearer the sea, the shells are 

 better preserved, and belong to modern species. These deposits are 

 preserved in the embayments reentering the highlands of the " White 

 Limestone," and are noted up to an elevation of 200 feet. The term 



* Geology of Jamaica, pp. 208-210, and p.p. 228-230. 



