■ BAGSHOT STRATA FROM ALDERSHOT TO WOKINGHAM. 505 



At St. Paul's rector}' two wells were dug a few years ago by my 

 friend the E-ev. J. T. Brown. Commencing at about the same level 

 with both wells, which are only a few yards distant from one 

 another, in one well 25 feet of butf-yellow sand was passed through, 

 and then a copious su]3ply of good water was obtained at the top of 

 the London Clay ; in the other a mere layer of yellow sand was 

 passed through, when the " blue clay " was pierced and penetrated 

 to a depth of 135 feet. This fact seems to admit of no other 

 explanation than pronounced erosion of the Loudon-Clay surface 

 beneath the Bagshot Sands of the Wokingham outlier. 



Just north of Wokingham station there is another exposure of 

 Bagshot Sands, which agree in character with the loamy sands of 

 the bed jS'o. 4 of figs. 1 and 2, to which reference has been so often 

 made. The sands are exposed just below St. Paul's church. Im- 

 mediately to the north of the bridge over the railway, the London 

 Clay with septarian nodules comes in at the bottom of the cutting, 

 and rises as we advance northward along the cutting until the 

 overlying sands disappear. Yet the stratification of both the Bag- 

 shot Sands and the London Clay is horizontal, as proved for the 

 former in the section below the church, for the latter in Mr. Phillips's 

 brickyard just below. Here, then, we have a case of the Bagshot 

 Sands (whatever particular horizon they may occupy in the Bagshot 

 Series) deposited against a denuded shelving shore of the London 

 Clay, unless we assume the presence of a fault hading at a very low 

 angle. This is more clearly expressed in the adjoining diagram 

 (fig. 4). 



Pig. 4. — Section in Cutting north of Wohingham Station. 

 .S. S". 



a, Bagshot Sand. b. London Olay- 



10, Bracknell. — Bracknell station (on the South-western Railway) 

 is 250 feet above O.D. level. In the long cutting east of this station 

 beds of the Middle and L^pper Bagshot Sands are exposed. 



ft. 



£?. Buff-yellow sands 10-15 



c. Bed of flint pebbles imbedded in sand 1 



b. Yellow loamy sand 6 



a. Dark black and green clay (exposed) 4 



The lowest bed {a) here exposed gave much trouble in making 

 the cutting. Being water-logged, it caused numerous " slips," so 

 that rushes had to be planted along the bottoms of the cutting- 

 slopes to give them security. The altitude of the pebble-bed at 

 this spot is -260 feet, which agrees with the altitude of a massive 



