46 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOG/Y. 



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 Eu- 

 distes recently described by Whitfield came from this section.^ 



Clarendon Section, Rio Minho, Clarendon Parish. 



14. Cambridge Beds, Chapelton Formation. — Yellow Marls and 

 limestones (further described under the head of Cambridge beds) with 

 Eocene fossils. Exposed between the town of Clarendon and St. Thomas 

 lliver +500 ft. 



13. Unconformity. Richmond Beds wanting. 



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 -1-300 ft. 



11. Impure granular semi-consolidated material 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 blufl's between Mile Posts 39 and 40. Its base in contact with 

 the foregoing is well shown at the crossing of the Minho. Estimated 

 thickness -1-300 ft. 



10. Stratified conglomerate of igneous pebble in red matrix becoming 

 black downward. 



9. Massive tuff or igneous rock 200 ft. 



8. Chocolate-red colored breccia ± 50 ft. 



7. Stratified (tuff?) conglomerate rounded black igneous pebble in 

 indurated mass. 



G. 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 Mile Posts 40 and 41, the 

 descent of Ballard Hill towards Ballard River, where over 150 feet 

 are seen ±200 ft. 



5. Tuffs. 



1 Bull. Am. Mu8. Nat. Hist., Vol. IX., Article XII., New York, 1897, pp. 

 185-190. 



