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PROCEEDINGS OE THE GEOLOGICAL SOCIETY. 



[Nov. 7, 



3. On the Sections oe Strata exposed in the Excavations for the 

 South High-level Sewer at Dulwich ; ivith Notices of the Fossils 

 found there and at Peckham. By Charles Rickman, Esq. 



(Communicated by the Assistant-Secretary.) 

 (Abstract.) 



In the autumn of 1859, open cuttings were made at Peckham, in 

 connexion with the " EfFra branch of the Great South High-level 

 Sewer," for the " main drainage " of the metropolis south of the 

 Thames ; and in the following spring a tunnel (330 yards in length) 

 was being constructed under the Five-fields at Dulwich. The beds 

 exposed in both sections belong to the "Woolwich and Reading 

 Series" of the Lower London Tertiaries (Prestwich). 



Four shafts were sunk to facilitate the driving of the tunnel ; and 

 the following beds were exposed ; but, as some of the beds are not 

 persistent, but die out even within the extent of the tunnel, the 

 several shafts differed as to the sections obtained from them. 



1. Soil, 9 inches. 2. Loamy clay (probably London Clay) ; 12 ft. 

 Not in shaft No. 1 (the most easterly), nor in No. 4 (the most 

 westerly), owing to the convex surface of the ground. 3. Light- 

 coloured clay ; 6 to 9 ft. 4. lleddish sand ; 5 ft. (not in No. 4 shaft). 

 5. Dark clay ; 1 ft. 10 in. 6. Blue clay; 2 ft. (not in No. 4). 7. 

 Dark clay ; 1 ft. (in No. 1 only). 8. Paludina-bed ; G to 15 inches. 

 [Fossils: Pitharella Richmani (Edwards), Palvdma lenta,P. aspera(?). 

 Bones and scales of Fish. Leaves.] 9. Cyrena-bed ; 1 to 2 ft. 

 [Cyrena cuneiformis, &c] 10. Oyster bed; 1 to 3 ft. [Ostrea tenera, 

 0. pidchra, 0. Bellovacina, 0. elephantopus, 0. edulina, Bysso-arca 

 Cailltaudi (?), Cyrena cuneiformis, C. deperdita, C. cordata, C. ob- 

 ovata, Melania inquinata, Melanopsis brevis, Modiola elegans,Fusus(?), 

 Cahfptro?a trochiformis, Corbula.] 11. Loamy sand ; Sin. (in No. 4 

 only). 12. Red sand ; 2 ft. (in No. 4 only). 13. Blue clay ; 2 ft. 6 in. 

 [Leaves.] 14. Dark sand ; 8 to 28 in. 15. Blue clay ; 18 in. to 

 9ft. [Laminated ; rich in Leaves, Lignite, Seed vessels. Rissoa, 

 Cyrena Dulivichensis (Rickman).] 16. Dark sand; 2 to 4ft. 17. 

 Light-coloured clay ; 2 ft. 6 in. (in No. 4 only). 18. Shell-rock ; 

 4 ft. thick, sometimes intercalated with stiff blue clay. [Cyrena 

 Didivichensis (Rickman), C. cordata, C. deperdita, C. cuneiformis, 

 Melania inquinata, Melanopsis, Neritina, Pitharella Richmani (Ed- 

 wards), Unio, Teredines in Lignite, Scutes of Crocodile, Fish-scales, 

 Chelonian and Mammalian bones.] 19. Clay ; 14 ft. and more : 

 reached only by the main shaft, No. 3, which appears to have been 

 sunk at the apex of a low anticlinal ; the beds gently dipping away 

 E. and W. 



All the fossils appear in their respective beds both at Peckham 

 and Dulwich. 



