1871.] 



WHITAKER TEETIA.ET CLIFF-SECTIONS. 



267 



described by successive authors is marked by the vertical lines on 

 the right of the following account, except for the irregular cap of 

 gravel, which appears in all but the earliest. 



1. Coarse red gravel, mostly of subangular flints, but also with flint pebbles, 

 rather clayey, 10 feet or more. 



2. London 

 Clay. 



10. 



/^ Grey and brown clay, sometimes 1 10 feet or more, 

 I 3 feet. I yielding water 



I Fine bufi' sand, passing into ( and causing 



■{ Brown and grey loam, passing into J slips. 

 Thinly bedded grey and brown clay, a few feet. 

 Basement-bed : flint-pebbles of moderate size in clay 



and ferruginous sand, about a foot. 

 4. Eoughly laminated bluish-grey clay (like London 

 Clay) about 4| feet (8 feet in Mr. Prestwich's 

 section). 



(Oyster-bed, rather hard, clayey, a foot to 2 

 feet or more (5 feet in the earlier account). 

 Shelly clays, 2 feet or more. 

 -p -, I Grey and brown clay, partly sandy, often 

 ^' with a bed of shells in the middle. 2| 

 _ l^ feet? 

 5'. Light-coloured sand, partly pink, with thin layers 

 of clay and traces of vegetable matter, yielding wa- 

 ter and causing slips, about 6 feet, passing into 

 fGrej laminated clay with a few layers of 

 .5". I shells, at one j)art a thin bed of ironstone 

 Shell \ vnth casts of shells, about 8 feet ? 

 Beds. I Shelly clay, a few feet. 



I Clay, with shells at bottom, about 2 feet, 

 ^ below which there is generally 

 A hard layer, in great part iron-pyrites ? an 

 inch or more. 

 [ Hard dark sand or clay, a few inches. 

 ' Thin peaty bed. (These three thin beds 

 vary ; sometimes the hard layer is absent, 

 sometimes the lignite.) 

 Pale grey and brown clay, partly lilac-coloured, 

 and with large pieces of selenite, 6 feet or more. 



8. Light-coloured sand, mostly of a pale yellowish- 

 green tint. At one part a bright-red mottled bed 

 near the top. In the middle a brown and appa- 

 rently harder bed, which projects (not accessible). 



9. Bottom bed, green-coated and iron-stained flints 

 in greensand, about 2 feet. It is from this bed 

 (or from a local clayey layer at its base) that the 

 Websterite has come. It rests evenly on 



Chalk with flints. 



Woolwich 



and 



Reading 



Beds. 



60 feet 



or 

 more. 





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The beds seem to vary both in thickness and structure, which 

 accounts for the slight differences in the various descriptions. 



The top of this small but interesting outlier is crowned by a Bri- 



* Quart. Journ. Geol. Soc. vol. x. p. 83. 



t Trans. Geol. Soc. (Ser. i.) vol. iv. p. 296. 



I The Fossils of the South Downs, or Illustrations of the Geology of Sussex 

 (4to, Lond.), p. 257. 



§ The Geology of the South-east of England (8vo, Lond.), p. 54. Merely 

 a shorter reprint of the former as regards this section. 



!| Trans. Geol. Soc. (Ser. i.) vol. ii. p. 191. 



