286 The Rev. W. BucklAnd on the Plastic Clay Formation. 



No. Feet. 



3. Ash coloured sand, slightly micaceous, without pebbles or 



shells 35 



This bed, though below the general floor of the middle pit, 

 is sunk into from it by deep shafts. 



MIDDLE PIT;* %, 



4. Coarse green sand, containing pebbles 5 



5. Thick bed of ferruginous sand, containing flint pebbles 12 



6. Loam and sand, in its upper part cream coloured, and 



containing nodules of friable marl, in its lower part 

 sandy and iron-shot - - . 4 



7. Three thin beds of clay, of which the upper and lower 



contain cythereae, and the middle oysters * - 3 



UPPER PIT. 



8. Brownish clay containing cytherese - - - — 

 This is the lowest bed sunk into in the upper pit, and is not 



there penetrated to a depth exceeding one foot. The in- 

 terval between this and No. 7, which occupies the summit 

 of the middle pit is not exactly ascertained, but cannot be 

 considerable ; probably - - - 6 



9. Lead coloured clay, containing impressions of leaves - 2 



10. Yellow sand - - - - - - -3 



11. Striped loam and plastic clay, containing a few pyritical 



casts of shells, and some thin seams of coaly matter - 1Q 



