HILL: GEOLOGY OF JAMAICA. 63 
Feet, 
Hard compact yellow limestone, very crystalline ; thickness about 10 
BE N o. s.s s. sv. 
Soft shaly yellowish limestone, showing peculiar strained concre- 
Monary nodules In one part of the bed . . . . . . . . 24 
Tellowish limestone, Hard and coarse . . . . . . . . .. 2 
ee ee up cr das ee ee 
+10) 
It is an interesting fact that Brown considered the yellow limestone 
beds of Christiana, from which Mr. F. C. Nichols later collected sev- 
eral of the Rudistes recently described by Professor Whitfield,! to be of 
Eocene age. This strongly suggests that future study of the locality 
May reveal a mixture of Cretaceous and Eocene genera like that occur- 
ring at Catadupa. 
The Cambridge beds, with their characteristic fossils, especially the 
Oyster and largo Cerithium, outcrop at many places in St. Ann, notably 
at Cave Valley, Boroughbridge, Yankee River, Pedro estate, and in the 
beds of Negro and St. Ann Rivers. They have also been noted in Tre- 
lawney at several places, and beds of Orbitoidal limestone with other 
fossils are well exposed near Freeman’s. The outcrops of the Cambridge 
in Westmoreland and Hanover parishes are all in the same general dis- 
triot as those of Catadupa and Cambridge in St. James, — the three 
Parishes meeting in this vicinity. The thickness is from 40 to 300 
feot, 
The identity of this formation is involved in Jamaican literature. In 
Places it is clearly defined and in others its identity is entirely lost. 
In De la Beche's chapter on the “ White Limestone ” of Jamaica,? 
Many descriptions of these beds and their fauna can be recognized. It 
is also tho “Nodular Limestone ” of Barrett's posthumous section pub- 
lished by Woodward,* and mentioned in our introductory chapter. 
In the Jamaican Reports it is the “Yellow Limestone" of Sawkins's 
Beneral section on page 24, and of the western parishes of St. Elizabeth, 
St, James, Hanover, and Westmoreland, as described by Brown, who 
Considered the formation to be Eocene. In the descriptions of the re- 
maininp parishes it has been so confused under many names with other 
beds of different age and position that its identification is somewhat diffi- 
Cult, although by careful study of the reports uncorrelated descriptions 
1 Bull. Am. Mus. Nat. Hist., New York, 1897, Vol. IX. pp. 185-196. 
2 Jamaican Reports, pp. 169-182. 
9 The Geological Magazine of 1864. 
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