WILTSHIRE.— ON THK RED CHALK OF ENGLAND. 273 
Geologists generally consider the Red Chalk as really equal to the 
Gaiilt. Many of the fossils certainly are gault species ; others no 
doubt belong to the Lower Chalk ; and, therefore, probably it is 
better to regard it as an intermediate formation between the Lower 
Chalk and the Lower Greensand, which comes into being when the 
Gault and Upper Greensand have almost thinned out. 
One of the members of our Committee, Mr. Rickard, has been 
good enough to make me an analysis of the Red Chalk of Speeton 
and Hunstanton. The Speeton is as follows : — 
Carbonate of lime, with a little alumina 81.2 
Peroxide of iron 4.3 
Silica 14.5 
100. 
From Hunstanton — 
Carbonate of lime, with a little alumina 82.3 
Peroxide of iron 6.4 
Silica 11.3 
100. 
The latter of which agi'ees remarkably well with the colour of the 
specimen, for the Red Chalk of Hunstanton is brighter than that of 
Speeton. 
Two specimens of the borings of Kentish Town, one a red argil- 
laceous and the other a siliceous mass, gave the following results : — 
Argillaceous — 
Peroxide of iron 6.5 
Carbonate of lime 13.5 
Silica and alumina (chiefly the latter) . . 80.0 
100. 
