Prof. T. Rupert Jones—Notes on a Well at Wokingham. 423 
Thickness of | Depth 
Beads in feet. | in fect. Strata passed through in sinking the well at Wokingham, Berks. 
209 | Flint pebbles, large, 33” long, and 6” long by 34” thick, 
grey-mottled outside, white and yellowish within, with 
yellow and faint umber concentric colours in middle, 
with grey spots, somewhat like Choanite structure. 
210 | Cement-stone in flat nodules, with irregular perforations,* 
roughly striated on their inside (Fucoidal). 
225 | Astarte (}” long). 
228 | Septarium. 
235 | Astarte (% long) 
Cement-stones, and beneath them a seam of black sand, 
with water. : 
at 264 | Dark-grey loam sand and shale; with Bivalves (Cytherea 
pee about 11”). Water here, at 120 gallons an 
our. 
y 265 | Fine quartzose sand, with green grains and a little mica: 
Ditrupa. 
2’ 266 | Cement-stones. 
1 268 | Dark sand with shells. 
Clay, and flat nodule of pyrites, containing fragment of 
large Bivalves, and ‘rough perforations like those in the 
Cement-stone at 210 feet. 
3 2704 | Sand and sandstone (as at 265’), with Ditrupa ; small 
black flint pebbles, and a small angular piece of rock. 
Thin seams of clay in the sand. Water rose 126 feet in 
the shaft, and would probably have risen 150’ had it not 
been pumped. 
[7 
bo 
Or 
oO 
10 feet of sandy and pebbly “ Basement 
Bed’’ of the London Clay. 
AN. 
ue 
bo 
S 
ed 273% | Glauconitic clay. 
ed 274 | Mottled clay. 
Ta 276 | Reddish clay. 
3 5’ | 280 | Brownish clay. 
3 4’ 285 | Mottled clay. 
a0 1s 289 | Sandy clay. 
iL. 290 | Friable clay and sandstone. 
2! 291 | Brown loamy clay. 
2’ 293 | Hard mottled clay. 
2! 295 | Grey sand and water. Water suddenly burst up the 16” 
if pipe, ee rose to within 42 feet of the surface. 
De 297 oamy clay. 
4 9 299 | Seam Of cal with clay. 
BE 301 | Mottled green clay. 
3 303 | Sandy clay. 
64’ | 306 | Mottled brown and red clay. 
14’ | 3123 | Sandy clay. 
a 314 | Greenish loamy clay. 
14 316 | Mottled clay. 
317 | Brown clay. 
¥ 321 | Grey sand. 
| 32 | 3213 | Mottled clay, with thin seams of greenish sand. 
ae 325 | Mottled clay with sand. 
‘¢ Woolwich and Readin 
54 feet of Clays, mottled and various, with 
some sand.— 
Ld 
1 ‘These perforations are similar in character to those in the surface of the Chalk 
underlying the ‘‘ Bottom Bed” of the Woolwich-and-Reading series at Reading and 
Newbury. These oblique and irregular holes, crossing one another, have been 
referred, with great probability, by Mr. Hudleston, F.G.S., to ‘“‘roots of marine 
plants’? growing on the sea-bottom (‘‘ Proceedings Geol. Assoe.”’ vol. iv. p. 521). 
Some of the perforations in the Chalk at Newbury (I may remark) are more horizon- 
tal than the others, are situated below the oblique holes, and are filled with a granular 
(perhaps foecoidal) chalky material. 
