80 Proceedings. 



Turning in a westerly direction alongside the railway, they 

 came into the direct road to Tilburstow HiU, leading north. 

 After proceeding for some distance on the fresh-water deposit 

 of the Weald Clay, the cottages on the eastern side were 

 passed, above which the lowest beds of the marine series 

 were reached. The Atherfield Clay has here a very narrow 

 outcrop of only a few feet wide. Eeaching the higher ground 

 beyond, the Hythe Beds of the Lower Greensand were 

 attested by a great change in the character of the vegetation 

 and of the soil on the banks ; still rising, they at length 

 nearly reached the summit of Tilburstow Hill, which escarp- 

 ment is formed by the rise of the stony beds of the Hythe 

 series. Turning into a narrow cart-track through a gate, 

 the party were conducted to a quarry in the Hythe Beds, 

 which are here thrown up to about 45°, the ordinary dip 

 being only about 7°. The Hythe Beds here consist of sand, 

 rubbly beds of sand and chert, ferruginous sandstone, and 

 chert, the last being quarried for road material. The upper 

 portion of the section in the quarry consists of Sandgate 

 Beds. A little further on, and at the summit of the hill, a 

 sand-pit by the road-side shows a fine section of the Sandgate 

 Beds : the lowest part much resembled the silver-sand of the 

 Folkestone Beds, and might have been mistaken for that 

 deposit were it not for its subordinate position in the section. 

 The Sandgate Beds here and in the Quarry appear to be an 

 outlier covering the Hythe Beds, where they are raised to 

 such an unusual inclination. A little lower on the north side 

 of the hill the Hythe Beds appear to subside into their 

 ordinary dip, and the Sandgate Beds are not found until 

 nearly at the foot of the hill, where they occur at the main 

 outcrop ; this outcrop trends in a S.W. direction, and reaches 

 the crest of the same range of hills nearer Bletchingley, 

 occupying the summit to Eedhill. The outlier on Tilburstow 

 Hill probably continues on the crest westwards until it 

 reaches the outcrop. The tendency of the oxide of u-on to 

 separate from the sand into thin horizontal or curved strata, 

 or into box-stones — as noticeable in the Folkestone Beds at 

 the sand-pit on Eedhill Common, and in the section of the 



