16g 



PROCEEDINGS OF tlSE GEOLOGICAL SbCifetf? 



Diagram B. 



Loc. Sect. Page 



Chesham 1 90 



Hedgerley... 3 vol. vi. 268 



Loc. Sect. Page 



Chobham ... 5... vol. iii.pl.H.f. 10. 

 Guildfotd ... 6 vol. vi. 200 



To these we have to add the follovring — 

 Loc. Sect. 



2 Brick-field at Oak End near Chalfont. 



4 Well-section. 



Diagram C. 



Loc. Sect. Page 



4 miles N. of Ware 1 



1 mile E.S.E. of Hertford... 2 

 Chalk pits near Northaw ... 3 



Winchmore Hill 4 



Colney Hatch 5 



Shoreditch 6 



92 

 . 92 

 . 92 

 .145 

 .145 

 .143 



Loc. Sect. Page 



Royal Mint 7 149 



New Cross, Naval School*. 8 105 



New Cross, Railway 9 104 



Sundridge Park 13 100 



Hayes Common..;. .18 ..... 99 



Keston Common 19 99 



The following are the additional sections not described in the text : — 

 Loc. Sect. 



10 Levrisham (see Buckland in Trans. Geol. Soc. ser. 2. vol. iv. p. 287;. 



11 Belmont near Chiselhurst. 



12 Section in brick-field on the hill half a mile N.W. of Chiselhurst 



Common. 



14 Section of the shaft at the chalk-pits on the S, side of Chiselhurst 



Common. 



15 Several small sections near Widmore and Leaves Green. 



16 ...... Small cuttings on the road-side between Bromley and Hayes. 



17 Pits on the N. side of Hayes Common. 



In these diagrams the local sections are not always taken on an exact straight 

 line of section ; where no sections ofi'ered on those Unes, sections at short distances 

 tb the right or left of them have been taken. In looking at the diagrams, it iS 

 necessary to imagine that the unfossiliferous portion of A should be a mottled dark 

 red, blue, and greenish colour, with subordinate beds of light yellow, which colours 

 gradually pass, in the fiuviatile area, into green at base, with grey, blue, red, 

 and yellow above, which again give way in the marine area to a nearly uniform 

 mass of very light green, assimilating greatly to the general tone of the underlying 

 Thanet sands. The prevailing colour of the Basement-bed of the London clay 

 should be ochreous of different depths of colouring, from very light yellow to deep 

 ferruginous. It was intended originally to have coloured these Diagrams. 



[^Erratum, p. 142, in column of figures line 15 from bottom, for 100 feet read 

 164 feet.] 



Plate II. 



Fig. 



Fossil Shells from the Woolwich Beds. 

 Outsde f Cardium Laytoni, Morris. Richborough. 



I. 

 2. 



3 b Enlarired f ^i^i'^^^'is <^^st of Corbula Arnouldii, Nyst. Oakwells. 



4 Perfect 1 



5" Outside 1 ^°i'^^l^ Regulbiensis, Morris. Redulvers. 



6. Outside Corbula Regulbiensis, var. j3, Aforrts. New Gross. 



7. Outside. I 



8. Inside. I Cyrena cordata, Morris. 



9. End view. J 



Deptford. 



* Local Sections 8 and 9 should be placed near together in the Diagraib< 



