264 
Mr. Weaver on the 
quay, beds are visible in alternation with each other, consisting of 
pure compact limestone, black slate clay, and limestone conglome- 
rate, composed of a base of bluish grey limestone, both compact and 
foliated, and involving numerous, closely crowded, rounded and 
angular fragments of clay slate, quartz, limestone, and rarely also of 
compact greenstone ; the two first mentioned substances predomi- 
nating. The ingredients of this conglomerate vary in size from 
that of small particles to masses as large as half the head; the 
finer grained variety of the compound resembling sandstone. The 
alternating beds of conglomerate, limestone, and slate clay vary in 
thickness from a few inches to two and three feet ; those of the 
conglomerate, in some of which I observed numerous entrochites 
and madreporites, being the most considerable. They range 
20° south of east and north of west, and dip 60° toward the north. 
In proceeding toward the martello tower, the beds of conglomerate 
gradually diminish in proportion, being succeeded by massy beds 
of blackish grey limestone, with a few interjacent thin beds of slate 
clay. This limestone' is fiat conchoidal and even in fracture, with 
a glimmering lustre, but when examined with a lens it is found to 
be composed of minute foliated grains. 
Farther south, the slate clay rather predominates, but the same 
range and dip are observable. At the point of the headland, the 
beds gradually acquire a vertical position ; and shortly after, they 
begin to decline toward the south at the high angle of 70°, yet 
still ranging as before, 20° south of east and north of west ; and 
they preserve this high elevation and regular range, as far as visible 
along the strand on the south side of Rush headland, except in 
the latter part, when they seem gradually to acquire again a 
northerly dip of 60*. 
