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VI.—Notes on the Well lately sunk at Wokingham, Berks
Published online by Cambridge University Press: 01 May 2009
Extract
Having been favoured by Mr. T. M. Quill, who has of late successfully completed an artesian well at Wokingham, with opportunities of examining the specimens brought up from the well, and with his own notes on the progress and results of the boring, 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 S.E. Eailways. A 6-foot shaft was sunk for 264 feet, penetrating the London Clay; a 24-inch pipe, through 6½ 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.
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page 423 note 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. Assoc.” vol. iv. p. 521). Some of the perforations in the Chalk at Newbury (I may remark) are more horizontal than the others, are situated below the oblique holes, and are filled with a granular (perhaps fœcoidal) chalky material.
page 424 note 1 This greyness may have been due to the intermixture of sand lying in perforations in the top of the Chalk.
page 424 note 2 At 70 feet below the surface.