46 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
beds to be found in Jamaica. In order to verify these previous obser- 
vations, the writer reviewed this section de novo and made the following 
record, which adds many new data. This section also shows the mode 
of occurrence of the fossiliferous Cretaceous rocks. Many of the Ru- 
distes recently described by Whitfield came from this section.! 
CLARENDON Suction, Rio MiNHo, CLARENDON PARISH. 
14. Cambridge Beds, Chapelton Formation. — Yellow Marls and 
limestones (further described under the head of Cambridge beds) with 
Kocene fossils. Exposed between the town of Clarendon and St. Thomas 
IVEY =; . 14 o e «000 fti 
13, Unoonformity. Delma B "n addon 
12. Minho Beds. — Volcanic tuffs and breccias, composed of igneous 
pebble (hornblende-andesites) cemented by a fine- -grained matrix. 
Groundmass ashen or dark green in color. Exposed in the banks of 
St. Thomas River west of the ford and the divide between the 
St. Thomas and Minho, and between Mile Posts 38 and 39. Esti- 
mated thickness. . . i seo e H300 fi 
11. Impure granular semi- aadd EN, of dark red color, 
with same pebble as above. This is largely an andesite tuff showing 
many particles of hornblende. This constitutes the faces of many 
fine bluffs between Mile Posts 39 and 40. Its base in contact with 
the foregoing is well shown at the crossing of the Minho, Estimated 
thickness . . . ‘ rie 300 fü 
10. Stratified A ofi igneous N ble! in p matrix becoming 
black downward. 
v. Massive tui or igneous Vok —. . |, v. 25 an ae 
8. Chocolate-red colored breccia . , i vt (css DO TUI 
7. Stratified (tuff?) conglomerate munde P igneous pebble in 
indurated mass, 
6. Ballard Clays. — Black, bituminous, laminated clays, sienna 
colored above, resembling in color the. Richmond beds, with occasional 
yellow calcareous interbedded layers, containing small colonies of 
Rudistes. This is finely exposed between Milo Posts 40 and 41, the 
descent of Ballard Hill towards Ballard River, where over 150 feet 
aro SCCM so «1... (1 e de OO 
5. Tuffs. 
1 Bull. Am. Mus. Nat. Hist, Vol IX, Article XII, New York, 1897, pp- 
185-196, 
