114 ME. T. LEIGHTON ON THE LOWER [May 1 89 5, 



contrary, I hope to show that the different beds can be followed 

 (although new features appear as one proceeds westward) from sec- 

 tion to section, and that there is a regular order of superposition. 



I left the detailed description of this district at the main line of 

 the L.B. & S.C.R. at Redhill. Immediately east of the railway, 

 find at several other places between Eedhill and Nuffield, the Fuller's 

 Earth is worked. The sections described in the Survey Memoir are 

 generally similar to these 1 ; the main bed of Fuller's Earth is at the 

 bottom of the series, but above that thin beds sometimes alternate 

 with the beds of stone (this is shown in the sections given in the 

 Survey Memoir, and can be seen in the Patteson Court pit now 

 open at Redhill). At Tilburstow Hill a thin bed of Fuller's Earth 

 underlies the main bed, and although I have not seen other instances, 

 they may of course occur. 



The stone-beds overlying the main bed of Fuller's Earth, and 

 alternating with thinner beds, are beds of massive greensand, sandy 

 limestone, soft sandstone, and hardened sands, the sandstones often 

 calcareous ; in some places these beds are fossiliferous. 



I have not observed any regular chert-beds at this horizon, but 

 sponge-remains occur, since Dr. Hinde on p. 407 of his paper men- 

 tions at Nuffield ' grey sandstone, filled with spicules.' Perhaps my 

 usual luck has deserted me here, but I have found a soft sandy 

 limestone or calcareous greensand with spicules, which sufficiently 

 answers to Dr. Hinde's description. Some of the sandstone-beds 

 contain nodular inclusions which may be sponge-remains. These 

 are very different rocks, however, from the ordinary beds of sponge- 

 remains. 



A short distance to the east is the important series of sections at 

 the Cockley Fuller's Earth Works, Park Fuller's Earth Works, and 

 in the lane thence south to Little Cormonger's Farm, mentioned as 

 before stated (p. 113) by Meyer, Whitaker, and Topley. I am able 

 to add a few points of interest to what has been already said on 

 these sections. At Brooker's Barn, in the extreme north of the 

 now-abandoned pits of the Cockley Works, the junction of the stone- 

 beds with the ironsands of the Folkestone series is seen. Above 

 the soft sandstone and calcareous greensand-beds is a Pebble-bed 

 with small lydites, pebbles of quartz, etc., in (usually) a dark 

 glauconitic, sandy matrix, but sometimes the latter is slightly 

 loamy. This stratum is highly false-bedded. Above it are the 

 ironsands, somewhat glaticonitic, and containing courses of stone 

 full of sponge-spicules and casts of fossils, with occasional pebbles. 

 The sands and courses of stone are both strongly false-bedded. The 

 western face of the pit to the south, under the 400-foot contour, 

 close to the high road, gives the following section : — 



Soil and red sand 4 feet. 



Iron-sandstone 6 to 8 inches. 



Stone -beds— hardened calcareous greensand and soft 

 sandstones ; blue and cream-coloured, with sometimes 

 dark clayey inclusions; certain beds with sponge- 

 spicules 26 feet seen. 



1 ' Geology of the Weald,' 1875, pp. 131-133. 



