66 
CHAP. V. 
THE CHALK FORMATION. 
This formation includes the following deposits ; 
namely, — 
1. Upper Chalk, with Flints T Crate Blanche of the French 
2. Lower Chalk, without Flints . . J Geologists. 
3. Chalk Marl Crate Tiifeau. 
4. Firestone, or Upper Green Sand . . Glauconie Crayeuse. 
5. Galt, or Folkstone Marl. 
6. Shanklin, or Lower Green Sand . . Glauconie Sableiise. 
1 . UPPER OR FLINTY CHALK. 
2 . LOWER CHALK. 
These deposits form by far the most considerable 
and important divisions of the chalk formation, and 
constitute the most striking features in the geology 
of Sussex. As their investigation is highly inter- 
esting, we shall endeavour to elucidate the sub- 
ject, by subjoining a brief notice of the course of 
the chalk through the south-eastern part of Eng- 
land, and the Continent. 
We are informed by Mr. Townsend, “ that the 
chalk hills are bounded by a line which stretches 
from south-west to north-east, and that within 
these limits they form three jirincijial mountain 
ranges. The first, leaving Berks, runs north 
through Bucks, Bedfordshire, and Hertfordshire, 
