48 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
subdivision of the Blue Mountain Series, and with all its variations is 
quite different from the Richmond beds of the upper division. 
In general, the Minho beds correspond in character with the “ Trap- 
pean Series and Purple Shales and Conglomerate Formation ” of the 
Jamaican Reports, occurring extensively from Clarendon eastward to 
Bath in St. Thomas, and notably near Gordontown, back of Kingston, 
in the ribbed salients (cuchillas) of Newcastle, and in Metcalfo, These 
beds are marked by great abundance of gravel and tuffs and purplish 
colors. They are placed in our section below the black shales and con- 
glomerates of the Richmond beds, not above, as in the final tabulation 
of the Jamaican Reports. 
The Fossiliferous Beds of the Lower Division of the Blue Mountain 
Series. — The massive limestones occur lower in the series in more or 
less isolated and widely separated outerops, nowhere of great thickness, 
and characterized by the Rudistean fossils. 
The Jamaican Reports treat of the fossiliferous Cretaceous beds in- 
cluded in the series as a single formation. It was described * as com- 
posed of two varieties of strata constituting an upper and lower part. 
The former was said to consist of marls and sands with corals and many 
Hippurites, tho latter of compact massive limestones with many Radio- 
lites and Barrettia. "These statements are misleading. It is true that 
the oldest fossiliferous Cretaceous rocks exposed are limestones, and that 
the marly beds with Cretaceous fossils, of which there are sevoral 
horizons instead of one, occur higher than the limestones; but these 
beds are merely incidents in the great series of volcanic tuffs and 
conglomerates with which they are interbedded, as is seen in the details 
of the Clarendon section. No. 2 of the Clarendon section with Creta- 
ceous fossils is the lowest limestone. These are overlain by the Franken- 
field tuffs. Above the latter appear fossiliferous beds of tho Logie 
Jreen,? and Ballard clays which in turn are covered by the Minho 
tufts. 
The Cretaceous limestones are found in several other places on the 
island. Sometimes a limited mass occurs in a manner to create doubt 
as to whether it is a bed, a local lens, or a great transported boulder ; 
1 Jamaican Reports, p. 26. 
2 Local beds of yellow marl and impure segregated limestone are also exposed 
near Trout Hall on the Minho, and at Pennant’s Great House on the St. Thomas, 
and consist of a considerable thickness of the unctuous yellow clays and segre- 
gated limestone lumps with numerous specimens of smaller Rudistes (including 
many of the species described by Whitfield) and corals. 
