Essex Well-Sections. 
169 
[? London Clay, 
repeated by • 
fault ?.] 
Hard cement-stones [specimen 
witli loam, as above]. 
Mottled silty clay [specimens, 
brown clay and sandy clay, with 
bit of green sand, ? carried 
a 
Mottled clay and cement-stones 
[specimen, stone with shell, 
? Cardium laytoni , ? basement- 
Silty clay and green sand [speci¬ 
men, brown and green clayey 
Cement-stones [specimen like that 
from 5 feet higher] . 
Mottled clay [specimen, brown 
Sand and shells [specimen, ? base¬ 
ment-bed] ... 
/Mottled clay and sand [specimen, 
clayey green sand, mottled red] 
Mottled clay [specimen, light- 
[Woolwich and 
Beading Beds.’ 
Hard reddish clay [specimen, red 
and grey mottled plastic clay] 
Bed clay [specimen somewhat 
mottled clay, dark brown, partly 
sandy]. 
[Thanet Sand.] -< 
Light-coloured clay [specimen, 
pale green-grey sandy clay] ... 
f Sandy loam . 
Dark sandy loam [specimens, from 
top 20 feet, fine grey sand; from 
next 28 feet, fine grey sand, with 
green grains; from bottom 7 feet, 
fine grey sand.] About 4 in. of 
Chalk, 703 ft. J 
Hard and compact chalk, with 
some flin ts in the upper part 
[specimen, white chalk with pale 
green-grey streaks] . 
Softer chalk . 
[Chalk] . 
ickness. 
Depth. 
1 ... 
3511 
131 ••• 
364f 
5 ... 
369f 
4 ... 
3731 
3 
4 ... 
3741 
7| ... 
382 
1 ... 
383 
4? ... 
387? 
7 ... 
394 
5 .;. 
399 
7? ... 
406 
5 ... 
411 
10 ... 
421 
1 ... 
422 
55 ... 
477 
523 ... 
1000 
46? ... 
1046 
4? 
1050 
130 ... 
1180 
The possibility of the disturbance of the beds having 
stopped the flow of water lias already been alluded to 
(pp. 149-50). 
