Page:Transactions of the Geological Society, 1st series, vol. 4.djvu/294

 Blackheath, Lewisham, Charlton, Woolwich, and on the east of Plumsted. In all these places the thin bed next above the chalk, which at Reading contains fishes teeth and oysters, is seen composed of a similar substance of loose green sand mixed with chalk flints, both rolled and angular, and generally coated with a dark green crust; but here they contain no organic remains, and seldom exceed two feet in thickness. Above this thin bed is a thick stratum of fine grained ash coloured sand, destitute of shells or pebbles, and varying in thickness generally from 30 to 40 feet. This stratum is seen to the greatest advantage in the Woolwich sand pits, where is an enormous artificial section, presenting the following order of succession:

Section of the Woolwich Pits, ascending from the lowest Strata.

(See coloured Section, Pl. 13, No. 1).