BRIGHTON SHELL-CONGLOMERATE. 385 
mussels, whelks, &c. enter into the composition of the con- 
solidated rock. The shelly and coralline limestones and 
sandstones, so abundant in the ancient strata of England 
Lien. 1238. SHELL-CONGLOMERATE; NOW FORMING IN THE BRITISH CHANNEL. 
Dredged off Brighton. 
Fig. 1.—An Aggregation of Shells and Corals; the interstices are 
filled up with sand, and the mass is consolidated by an 
infiltration of carbonate of lime. 
2.—TROCHUS ZIZIPHINUS; extricated from the mass with the 
following : 
3.—PECTEN OPERCULARIS. 
4.—SERPULA. 
5.—Portion of a CELLEPORA; magnified. 
6.—SABELLA. 
have been formed in a similar manner; and when the 
modern conglomerate of Brighton shall have been permeated 
with crystalline matter, and subjected to great pressure by 
VOL. I. ec 
