44 BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
* Trappean Series,” “Cretaceous Limestone," and “Yellow Limestone” 
(as used for the western parishes). 
While it is still impossible completely to differentiate all the beds of 
the Blue Mountain Series, our observations have enabled us to make 
a more accurate classification of them than any hitherto presented, 
which may be stated as follows : — 
Upper Division 
(Eocene) Richmond Beds. 
Blue Mountain Series 
Lower Division Minho Beds. 
(Upper Cretaceous) Ballard de 
Logie Green 
Frankenfield “ 
Jerusalem u 
Yallahs " 
The Basement Beds. — The chief difficulty of classification is the com- 
plex folding and partial concealment which make it impossible to deter- 
mine the exact base of the series. The Jamaican Reports present 
conflicting conclusions on this subject, inconsistently stating in different 
places that the base of the section is composed of igneous rocks, Creta- 
ceous limestones, and a formation termed the * Metamorphosed Series." 
From tbe tabulations, especially that given on the last page of the 
Reports, one infers that its authors believed the base of the Jamaican 
section was erystalline and overlain by the so called * Metamorphosed 
Series ” benegth the limestones with Cretaceous fossils, but a careful 
perusal of the Reports does not justify this interpretation. In numerous 
places throughout the text of the work the intrusive nature of the 
igneous rocks into the beds of the Blue Mountain Series is noted, as 
further recorded in the portion of our report treating of the igneous 
rocks. Sawkins! expresses doubt as to the propriety of drawing a dis- 
tinction between the Cretaceous and the so called * Metamorphosed 
Series," and clearly states that the latter “comprises strata of the 
Cretaceous and conglomerate formations which have experienced a change 
of structure due to the intrusion of igneous rocks."? In view of this 
act, as verified by our own observations, the so called “ Metamorphosed 
Series,” as a structural formation, may be dismissed from consideration. 
There may be doubt as to whether the oldest rocks are Cretaceous 
limestone, which Etheridge asserts * “is clearly at the base of the series,” 
1 Jamaican Reports, p. 55. 2 Tbid., p. 47. 8 Ibid., p. 308, 
