104 PROCEEDINGS OF THE GEOLOGICAL SOCIETY, 



Fig. 10. — Section on the Railway near the Blackheath Station. 



Feet. 

 /. Blackheath pebble bed 10 to 12 



~ e. Brownish sand 2 



d. Comminuted shells in 

 light- coloured clay 



with pebbles 4 



c. Comminuted shells in 



greenish grey clay* .. 2 

 b. Light green sandy clays, 



mottled red and grey 7 

 a. Light greenish sands 



with a few pebbles... 6 

 III. Tbanet Sands. 



Here the upper part of " a " of the preceding section passes into 

 mottled clays. The fossils of "c" are similar to those of the same 

 bed at Charlton and "Woolwich: those of " d and e" are few and 

 badly preserved, but at a distance of about half a mile further west- 

 ward towards Lee these beds are richer in organic remains, which 

 are for the greater part the same as those found in the " Pebbly 

 Sands" at Woolwich, but not so well preserved. The main points 

 of difference are, the far greater abundance of the Modiola Mitchelli 

 at Lee, — a shell extremely rare at Woolwich, — and the absence or 

 great rarity at the former place of the Cardimn and Pectuncuhis. 



In the neighbourhood of Blackheath this upper portion of the 

 middle division of the Lower London Tertiaries often consists of alter- 

 nating thin layers of light grey or brownish clays and yellow sand, 

 which in the section of Loam Pit Hill, Dr. Buckland designated as 

 "striped sands" and "striped loams"; and the former term has 

 since been applied by Mr. De la Condamine to denote generally the 

 upper part of this division, — a subdivision, however, which, although 

 well-marked in that vicinity, can only be considered as a local feature. 



The railway cutting at New Cross was interesting from its exposing 

 a more freshwater conditionf of the strata than usually prevails, and 

 from its showing the relation of these upper beds of the Woolwdch 

 series to the London clay. Only the higher beds of the group were 

 here exposed, consisting of — 



(PL I. Diag. C, Loc. sect. 9.) 



Feet. 



London clay 40 



Basement-bed London clay (flint-pebbles in ochreous sand) ... 1 to 2 



i. Yellow sand 2^ 



h. Clay and sand, with shells occasionally 3 



g. Baud of freshwater limestone {Paludina) 0^ to 1 



f. Sand and shells 6 



e. Clayey sand and shells 5 



The order of succession of the lower beds was made known by a 

 well sunk at the Naval School, New Cross. 



* At a distance of a quarter of a mile E. this bed becomes 6 feet thick, of a 

 dark grey colour, and full of shells. 



t The same beds extend to Peckham on one side, and to Counter Hill and 

 Lewisham on the other. 



