418 
LOWER OOLITIC EOCK.S OF ENGLAND: 
FlG 115. 
Section north-west of Stamford. 
9. Great Oolite Limestone 
8. Sandy and ferruginous 
clay - 
7. Blue and brown clay - 
6. Banded green and grey 
shelly clay 
5. Purplish, green, and 
Upper grey clay 
Estuarine<( 4. White and grey, pur- 
Series, plish carbonaceous 
clays, with selenite, 
and sandy layers 
with rootlets - 
3. Dark red ironstone 
[2. Ferruginous clay 
1. Lincolnshire Limestone. 
FT. IN. 
3 6 
4 0. 
11 


Prof. Judd states that : "At Little Bytham, at the adamantine 
clinker works beside the Great Northern Baihvay, the clays of 
the Upper Estuarine Series are extensively dug for the purpose 
of making bricks of peculiarly excellent quality, which, from the 
ringing sound which they give when struck together, are known 
as ' clinker bricks.' We have here a, very interesting section 
exposed " : 
Section at the " Clinker Works " and Raihcay-cutting, Little 
Bytham. 
FT. IN. 
"Soil -7"- - - 6 
Tea-green clays - - - 1 2 
Brown, sandy clay - 1 
Greenish clay, full of soft, white, carbo- 
nate of lime [" race "] 1 
Variegated blue and brown, sandy clay 1 6 
Blue clay 6 
Blue and brown, sandy clay - - 1 6 
Bed of indurated sand with fossils 6 
