472 Dr. Nugent Geology of the Island of Antigua . 
clearer. No. 2 dips at a great angle, and No. 4 is not conformable 
but overlying. 
With regard to the difference of silicified coral and wood in 
No. 2, and that of No. 3 and 4, 1 can distinguish immediately, and 
whenever presented to me, the corallines of the two beds, not so 
much from any difference in the species (though I believe them to 
be different) as from the state of their mineralization ; their appear- 
ance is quite dissimilar ; those of No. 2 are properly coralline chert, 
opake with small patterns ; and those of No. 4 properly coralline 
agate, with calcedonic quartz, carnelian, &c. There is no petrified 
wood in No. 4 ; and those of No. 2 and 3 present no remarkable 
difference ; it is difficult to distinguish the species of wood, except 
in the case of the palm, one of the most abundant. There are no 
instances of conglomerate or gravel beds lying on the marl in 
insulated patches, but such occur included in and subordinate to it ; 
as at Eliot’s, Vernon’s, and the Belfast Chapel, mentioned in 
the paper. The freestone and limestone strata in the marl 
are not conformable to those of No. 2 ; but frequently hori- 
zontal, or inclined in other directions. You wish to know whether 
the section is correct representing the chert on the marl at Otto’s 
and St. John’s Church. I consider the chert, No. 3, to be subor- 
dinate to the marl No. 4, and occupying the lower beds of it; 
this does not of course preclude the possibility of a portion of the 
marl being under the chert ; and its being so at Otto’s hill, Church 
