422 Prof. T. Rupert Jones—WNotes on a Well at Wokingham. 
I have drawn up a tabular statement of the strata pierced on that 
occasion. The well was begun in May, 1879, in the London Clay, 
on the low ground at the foot of the hill of Bagshot Sand on 
which Wokingham stands, near the junction of the S.W. and §.E. 
Railways. <A 6-foot shaft was sunk for 264 feet, penetrating the 
London Clay; a 24-inch pipe, through 64 feet of sand and clay of 
the “Basement Bed,” then reached a water-bearing sand of the 
same series; and a pipe (16-inch) and bore-hole were continued for 
138 feet, down to 408 feet, at a level of 64 feet in the Chalk, where 
an abundant supply of water was obtained. The 16-inch pipe was 
sunk to 355 feet, having sunk several feet in the Chalk by its own 
weight (18 tons) on the cutting edge of its “shoe.” From 350 feet 
down to 408 feet, a 15-inch bore-hole was made in the solid Chalk 
and flints, without any pipe to line it. The pipe traversed the lower 
part (84 feet) of the “‘ Basement Bed of the London Clay,” 544 feet 
of mottled clays and sand of the ‘“‘ Woolwich and Reading Series ” 
(with water in sand at 295 feet), and 16 feet of the sands and 
“ Bottom Bed” of that formation, before it entered the Chalk. No 
Oyster shells were observed in the “ Bottom Bed.” The grey colour 
attributed to the upper portion of the Chalk (at 344’ to 352’) may 
have been caused by the admixture of greenish sand occupying 
perforations in the Chalk, as in other parts of Berkshire. 
The following are the details :— 
At top 1 foot of surface soil. 
Thickness of | Depth | Strata passed through in sinking the well at Wokingham, Berks. 
Beds in feet. | in feet. . 
{ (263feet| 1 | London Clay, fawn-coloured (weathered). 
of 5 Rusty-brown (weathered) ; with small Bivalves (Cardiwm). 
London} 12 Blue and compact (drying on exposure to dark-grey) ; 
Clay.) Septarium, with large Bivalve (Cyprina). 
14 Septarium, with small Cardiwm ; Pholadomya virgulosa 
(pearly), large and small, in the clay. 
18 | Large Nautilus in septarium. 
45 Cyprina planata (large), several. 
52 Seam of rounded flint shingle of large and small pebbles, 
grey-mottled outside, whitish within. 
62 Pholadomya virgulosa. 
70 =| Panopea intermedia. (Loamy from 70’ to 82’, with water.) 
SSS ee ee, 
~I 
f=) 
bo| 
x | Septarium with pyrites. 
< 73 | Thin seam of black (flint ?) sand. 
= 733 | Septarium. 
3 81 Septaria : 1 foot. 
aS) 90 | Pholadomya virgulosa (pearly). 
a 95 | Septarium with pyrites; and nodule of pyrites, irregular 
pa im shape. 
oH 120 Teredo, piece of thick tube. 
2 137 y 
$3 147 Septarium. 
AN 
155 | Pinna, crushed fragment. 
162 Septarium. 
184 Dentalium, Acteon (pyritous), and Natica in the clay ; and 
a septarium. 
189 Septarium. 
