4 62 Dr. No gent on the Geology of the Island of Antigua* 
eastern coast, particularly Pelican and Crump Islands : it is that pale 
yellowish free-stone, of which so much use is made in building, and 
is composed entirely of siliceous particles, carbonate of lime, and a 
little oxyd of iron. Another indurated rock is occasionally found in 
this marl ; a pudding stone, or breccia, consisting of an agglutination 
of fragments of differently coloured porphyries, with a gritty basis ; 
this occurs near Belfast Chapel, and on the high road near Vernon’s. 
The calcareous formation is replete with a variety of fossil shells 
and corallines, both in a calcareous and a siliceous state ; but whether 
they are of different species from those now inhabiting the sur- 
rounding sea, future observation must point out: if a difference 
should be found, it will probably be in a few instances merely, the 
greater part (I mean those of marine origin) being certainly analo- 
gous to the existing species. One is often puzzled here in ascer- 
taining species by only meeting with the casts. The calcareous 
fossils may be stated to be of two descriptions ; those, which, being 
found in the indurated limestone, are either assimilated in compo- 
sition with it, or of which the casts merely remain ; and those, 
which, being found in the more marly parts, still preserve their 
original composition and configuration, and even in a considerable 
degree their pearly lustre and appropriate colour ; so much is this 
the case, that one would almost be inclined to suppose they were 
derived from the sea within the memory of the present race, and 
were not the result of changes the earth had undergone in former 
ages ; but all doubt must vanish when we find them closely 
attended by similar fossils, of which nothing but the casts are left, 
or completely changed into calcareous spar, or into flint and agate. 
Of the fossils common to the limestone, strictly speaking, we may 
enumerate, as most frequently presenting themselves, different 
species of madrepore, echinus, serpula, pecten, cardinal, strombus, 
