The Ilcv. \V. Buckland on the Plastic Clay Formation. 285 



7. Blue and brown clay — striped and full of shells, chiefly 



cerithia and cytherese - - - - - 9 



8. Clay striped with brown and red, and containing a few 



shells of the above species ----- (j 



9. Rolled flints mixed with a little sand, occasionally con- 



taining shells like those near Bromley ; e. g. ostrea, 

 cerithium and cytherea. (These shells occur dissemi- 

 nated in irregular patches) - - - - -12 

 10. Alluvium -_---.-_ — 



Total thickness 81 



No. 1 and 2 are not laid open in the great sand pits, but are seen 

 in a chalk pit adjoining to the eastern extremity of the sand pit. 



The following section at Loam Pit Hill, near Lewisham, about three 

 miles south-west of Woolwich, presents analogies that identify many 

 strata in the two sections, as from the chalk upwards to No. 8 ; in 

 each inclusively the principal difference consists in the presence of 

 fewer or more pebbles, in beds of sand evidently contemporaneous. 



Section of three Pits on Loam Pit Hdl^ near Lewisham. 



(See coloured Section, PI. 13, No. 2*). 



LOWER PIT. 

 No. Feet. 



1. Chalk with beds and nodules of flint - - - — 



2. Green sand identical with the Reading oyster bed, and in 



every respect resembling No. 2 at Woolwich 1 



* These beds cannot all be observed at one section, but maybe traced along the sloping 

 surface of the lull, at three successive apertures near each other, in which the upper stra- 

 tum of each lower pit is dug into, and forms the floor of the one next above it. 



In the section No. 2, the intermediate spaces are unnaturally contracted, and expressed 

 by two narrow caps of alluvium. 



Vol. iv. 2o 



