178 EEV. A. lEVnfG ON THE STEATIGEAPHX 



stands. See fig. 1 of mj former paper (vol. xliii. of the Quarterly 

 Journal). 



Having roughly mapped the stretch of country dealt with in this 

 part of the present paper, I am the more strengthened in the view 

 which is put forward. It is my intention to present a copy of the 

 map to the Society's Library when the details of it are complete. 

 It should be noted that the boundary of the Middle Group was 

 marked provisionally with a broken line from the South-Eastem 

 Eailway to near Sunninghill on the earlier editions of the Survey 

 Map. 



Pae,t II. — The Highcleee Section. 



My attention was first drawn to this by F. J. Bennett, Esq., 

 E.G.S., of H.M. Geological Survey, and in particular to that portion 

 about half a mile south of Highclere Station. Prof. T. Eupert 

 Jones has kindly furnished me with a sketch of part of the section 

 in the cutting north of the Station through Tot Hill. This was 

 made in 1882, when the construction of the line was in progress. 

 A short notice of the same section was furnished by him to the 

 ' Geological Magazine ' (dec. iii. vol. i. pp. 122, 123). The general 

 dip, as measured by him in this section, is 3° S., the same dip being 

 observed in the London Clay in a cutting north of the Enbourne ; 

 while the general dip of the Bagshot Beds in the cutting further 

 south is about 10° N., as measured by Mr. Bennett and myself. 

 These facts point plainly to the existence of a sjTiclinal flexure*, 

 the axis of which, east and west, runs along the valley to the south 

 of the Station (see fig. p. 179). On my first visit, in company 

 with Mr. Bennett, I detected the green earthy sands of the Middle 

 Bagshot exposed in the cutting-slope for some distance at the 

 northern end of the southern cutting. These are succeeded south- 

 wards by the clayey series, which everywhere forms the basement 

 of the Middle Bagshot, and must be claimed as such in this section, 

 although Mr. Bennett first drew my attention to them as clays of 

 the Lower Group. They are about 30 ft. thick, and furnish a striking 

 example of the way in which not only these but also the higher 

 clay -beds of the Middle Group are sometimes found to thicken at 

 the expense of the more sandy members of the series, as we 

 approach the London Clay, in tracing them across the countryf. 

 These clays, with which towards the base considerable bands of 

 ironstone are interbedded, are succeeded downwards by a fine quartz- 

 sand, which at lower horizons becomes rather loamy. Attention 

 should be drawn to the remarkable lithological similarity (making 

 allowance for differences in thickness) of the several beds and the 

 order of their succession to that already recorded for the beds jSTo. 7 

 to 12 of the WeUington-CoRege district J. Mr. Bennett informed 



* Probably a westerlj^ extension of the " Farnborough Sjncline," Quart, 

 Journ. Geol. Soc. vol. xli. p. 506. 



t E. g. in the section in the Swinley brick-yard {mjpra, p. 165). 

 X Quart. Journ. Geol. Soc. toI. sli. p. 494, &c. 



