BULLETIN: MUSEUM OF COMPARATIVE ZOÜLOGY. 
Feet, 
S White limestone with Actwonela o s r o o .. MW 
7. White limestone slightly yellowish . . . : «+ te « 20 
6. Yellow marl alternating with limestone . . . . . . . 50 
Purple shale in yellow limestone andmarl . . . . . . 15 
» 
Red * Trappean" conglomerate . . . org 
hr 
4. 
3. Yellow marls with limestone lumps and zd Cay aprinas . 29 
2. Three feet layer of limestone with giant Caprinas . . . . 67 
1. 
Yellow clays and limestones o = e + 1 + s+ roe 0. 23 
Nos. I., IL, IIL., and IV. of the foregoing sections are undoubtedly of 
later age than V., and owe their present lower topographic position to 
faulting or later unconformable deposition. It is interesting to note 
that the gigantic species of Rudistes occurs at the base of this section in 
bed V. 2, 
out the island. 
It is unfortunate that here the relations of the fossiliferous formations 
to the other beds of the Blue Mountain Series are concealed. 
It might be supposed that the yellow clays at the top of the Jeru- 
a low position apparently persistently maintained through- 
salem section represent the horizon of similar material elsewhere widely 
separated from the lower limestones by vast beds of tufls and igneous 
conglomerates. The paleontologic data do not demonstrate this con- 
clusion, the fossils of the Jerusalem clay beds (Pholadomya and Ostræa) 
not being found ‘at other localities, nor are some of the smaller species 
of Rudistes of probably higher horizons found here. Outerops of 
** Cretaceous limestone” 500 feet thick in St. Thomas-in-the-Vale,! and 
300 feet thick in Port Royal, are also recorded, but the writer has not 
seen them. 
It is barely possible that a locality in Portland, mentioned by 
Barrett,® may represent the upper clay horizon. This was described as | 
“ a sandstone conformable with a thick bed of clay containing Hamites, | 
Baculites, Trigonia, and Pholadomya.” This reference is the only | 
mention of the first three fossils from Jamaica. | 
Near Bath, at the eastern end of the island, Cretaceous limestones are | 
exposed in the elevated structure near the southern base of the moun- | 
tains. This is the locality from which the Cretaceous of Jamaica was | 
first described by Barrett, who published a figure of the section.* The | 
principal formation of this vicinity is the Minho beds (Trappean of | 
1 The Cretaceous of St. James, as described by Sawkins (Jamaican Reporte, P: 
245) is the Cambridge formation of this paper. 
2 Jamaican Reports, p. 198. 8 Ibid, p. 02. 4 Ibid., p. 77. 
