678 MR. F. CHAPMAN ON THE BARGATE BEDS OF STTRRET. [Nov. 1 894, 



(though perhaps encroaching upon each) and possibly equivalent m 

 age to the Sandgate Beds. 



Like the Sandgate Beds at Sandgate and elsewhere, the Bargate 

 Beds are characterized by much argillaceous material, which occurs 

 in them as numerous thin bands intercalated between the pebbly 

 and sandy deposits. Moreover, the Bargate Beds thin out and dis- 

 appear towards the area occupied by the Sandgate Beds. 



In the Weald Memoir l a reference is made by F. Drew to a 

 lane-section west of St. Martha's Chapel, near Guildford, noting 

 " apparently a representative of the Sandgate Beds." The beds 

 thus remarked upon consist of pebbly and sandy strata, with some 

 argillaceous material, and are without doubt referable to the top of 

 the Bargate series. They pass down with perfect sequence into the 

 Bargate Stone Beds. 



At the base of the Folkestone Beds in some localities there are 

 well-marked bands of ochreous clay which, I am inclined to think, 

 are of the same age as the Bargate Beds. One section, in particular, 

 the first large exposure on the road from Dorking to Horsham, 

 shows clay seams, in some parts many inches in thickness, inter- 

 stratified with the sand. In this clay numerous species of arenace- 

 ous foraminifera were found, to which reference will be made in the 

 sequel. But an examination of several samples of argillaceous 

 material from beds of undoubted Folkestone age gave no traces 

 of foraminifera, nor other organic remains. On the other hand, 

 a typical specimen of the Sandgate Beds from Sandgate, collected 

 by Mr. E. H. Schwarz, and kindly placed by him at my disposal, 

 contains a large assemblage both of foraminifera and ostracoda, with 

 many species equally characteristic of the Bargate Beds. This 

 specimen of Sandgate Clay also yielded many other organic particles, 

 such as siliceous replacements of spines of echinoderms, which had 

 hitherto been considered peculiar to the Bargate Stone and Pebble- 

 beds. 



II. The Bargate Stoke and Pebble-beds in Littleton-lane 

 Quarry, near Gutldford. 



Detailed measurements of the beds in this quarry, about one mile 

 S.W. of Guildford, previously given by C. J. A. Meyer 2 differ 

 slightly from those now exposed in the quarry. 



The following beds are seen in the section, in descending order : — 



ft. in. 



7. Sand, with interbedded Bargate Stone 15 



6. Brownish sand, with rolled if ssils 3 



b. Whitish siliceous bed (with sponge-remains) Gin. to 2 



4. Pale sands, current-bedded 3 



3. Laminated sands and pebbly clays, passing into 9 



2. Layer ot Hibangular pebbles in clay (foraminifera-bed) 3 



1. Greenish sandy beds, wiih some clay, and containing a large pro- 

 portion of oolitic ironstone-grains ; coarsely current-bedded in the 



lower half; and with carbonaceous bands and fucoid (?) markings 3 



Below this and down to the floor of quarry, Hythe Sands 12 



1 Op. cit. p. 134, referring also to p. 122. 2 Op. cit. p. 11. 



