504 EEV. A. IRYIKG 0:S A GE^TEEAL SECTIO:Jsr OF THE 



slope of Upwick's Hill a clay-bed -with, intercalated layers of green 

 sand is exposed in a clay-pit on the 250 feet contour-line. This 

 agrees in character with the bed Xo. 5 (fig. 2). Above it is a loamy 

 bed stained green, as the bed Xo. 4 is occasionally, where, when 

 the contour of the country was somewhat different, it may have 

 underlain for a long time a marshy deposit. Some 20 or 30 feet 

 below this, a light-coloured clay, which resembles very closely the 

 lower clay of the ]Middie Division (jS"os. 9 and 10), is extensively 

 worked for bricks in Mr. Walter's brickyards. This I am now 

 disposed (after examining the evidence more closely) to regard as 

 belonging to that horizon, even though the sandy beds exposed 

 immediately above it in the same section are not green, the green 

 colour having been probably changed to a rusty brown by recent 

 oxidation. 



8. Road-section ^-mile north of Wellinf/ton College. — The new 

 road to AYokingham crosses here the same line of valley (7) as that 

 which the railway crosses north of the station. 



The slight anticlinal arrangement of the Middle Bagshot beds 

 (Nos. 4, 5, 7, figs. 1 and 2) is shown here more plainly. The over- 

 lying pebble-bed (jS'o. 3) is found on both sides of the valley, and 

 the beds jS^os. 4 and 5 are well exposed in the road-cuttings on 

 either side. The clay-bed (No. 9) appears low down the valley and 

 is seen by the side of the ditch. Halfway between these two sec- 

 tions the bed Xo. 5 was worked near Clark's cottage for bricks about 

 fifteen years ago. 



9. Wokingham. — On the map this town is represented as lying on 

 an outlier of Lower Bagshot Sand (i. 4). This, however, admits of 

 question, since the sands, wherever exposed or penetrated in the 

 numerous wells (from 20 to 30 feet deep) in the town, are buff'-yellow 

 sands like those of the Upper Division. There is a section exposed on 

 the South-western Eailway, where the footpath crosses the line be- 

 tween the town and Tangleys. The beds exposed here consist of sand 

 and light loam with thin layers of pipe-clay, and are more like the 

 bed at the top of the Middle Division (No. 4, fig. 2) exposed in the 

 railway-section at Wellington-College station, than anything else 

 with which I am acquainted in the Bagshot Series. The height 

 here is 200 fe^t, and the London Clay is met with about 4 feet 

 below the line, while a little further down the valley to the west 

 the Wokingham Town well* commences in the London Clay itself. 

 The beds exposed in this cutting are horizontal in an east-and-west 

 direction ; but from the absence of good exposures on the northern 

 slope of the cutting, it is impossible to say if there is any dip in a 

 north-and- south direction. One or two thin lines of pebbles occur 

 in this section, and upon the sands just described a bed of pebbles 

 (cut through in places by later drift) is to be seen. Wot far from 

 this cutting the London Clay is worked in Mr. Churchman's brick- 

 yard, and there the buff'-yellow sands of the hill-cap are seen filling 

 the hollows of the eroded surface of the London Clay. 



* Described by Prof. T. Eupert Jones, F.E.S., in the Geo!. Mag. dec. ii. 

 vol. vii. p. 421, &c. 



