112 ME. T. LEIGHTON ON THE LOWER [May 1895, 



are again seen at a level 50 feet lower. As the Atherfield Clay 

 crops out in tbe valley below, I take this repetition of beds to 

 be occasioned by a big slip or ' escarprnent-fault ' which probably 

 conceals the white, sometimes calcareous, sands seen in the section 

 on the main line of the L.B. & S.C.R. on the opposite side of the 

 valley. These white, sometimes calcareous, sands and sandstones 

 will be referred to presently (pp. 113, 115, etc.). 



From want of connecting evidence the succession here is rendered 

 somewhat obscure, but I believe that the explanation which I have 

 given is the true one. Neither pit on Redhill Common is now 

 worked, so that, on account of the slopes, it is difficult to estimate 

 the thickness of the two sands. However, of the coarse, false- 

 bedded, buff sands at least 30 feet is seen, and of the crimson- 

 mottled compact sands at least 20 feet. The pebble-bed on Redhill 

 Common crops out at about 420 O.D., or at least 100 feet higher 

 than at Bell Street, Reigate, but the latter section lies a little south 

 of the parallel. A fall of all the beds hereabouts towards the west 

 will also connect the coarse, false-bedded, buff sands (with beds of 

 grit and pebbles) of the south end of the upper pit on Redhill 

 Common, with the similar exposures in Park Road and at Trumpets- 

 hill, Reigate. 



My view of the succession at Redhill is further supported by 

 the fact that just to the east of north of the common, striking 

 N.N.E.-S.S.W., is the Merstham fault with downthrow to the 

 west — a sharp dip to west immediately south of such a fault is only 

 to be expected. Accepting this view of the succession as correct, 

 we have another opportunity of roughly estimating the horizon of 

 the Pebble-beds of Redhill, by the levels respectively of their outcrop 

 and of that of the Atherfield Clay. In the valley below the common 

 the top of the Atherfield Clay crops out at 250 O.D. or thereabouts, 

 or 170 feet below the Pebble-beds. The outcrop of the Atherfield 

 Clay lies a little south of that of the Pebble-beds, but allowance 

 must be made for a probable slight anticlinal along the continuation 

 of the line of fault, of which indeed the dips recorded on the 

 Geological Survey map afford some evidence. 



Before proceeding to consider the sections to the east, it will be 

 well to say something concerning the present position of the discussion 

 as to the correct horizon of the Fuller's Earth Beds around Nuffield. 

 The opinions of the pre-Survey writers need not detain us now, as 

 they were fully set forth by Mr. Topley in the "Weald Memoir, and 

 by Mr. Meyer in his paper of 1866. My reason for passing over the 

 opinions of these early writers here by no means arises from want of 

 appreciation of the work that they have done in assisting to elucidate 

 these difficult sections ; in addition to the reason stated above, it is to 

 be noticed that they make no mention of the Pebble-beds, and their 

 occasional references to the Chert-beds are difficult to identify. 



Mr. Meyer, I believe, first called attention to the Pebble-beds in 

 this district in his paper in the Geological Magazine for 1866 (p. 16). 

 The section which he gives is the one in the lane leading to ^Little 

 ConnongerVFarm, without doubt the same section as that quoted 



