150 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



In this and the following section the development of the pebble 

 beds in the lower part of the Woolwich series is remarkable. 



Well-section, fValtons Sugar-house, Angel Court, Wkitech(q)el. 



(Dr. Mitchell's MSS. vol. iv. p. 48.) 



Feet. 



London Clay. 



I. Woolwich and 

 Reading Series, • 

 69 feet. 



Mould and soil 6 



Gravel 12 



b. YellovF clay 3 



a. Blue clay 97 



p. Light green sand and some clay 6 



0. Blue clay and sand 2 



n. Dark brown clay 12 



m. Blue clay and sand 2 



I. Blue clay and sand with shells 2 



k. Hard sand 1 



j. Hard green sand and clay 1 



i. Red and grey clay 2 



h. Yellow clay with pebbles 4 



g. Clay and gravel conglomerate, very 



hard, with large pebbles 9 



f. Sand, pebbles, and a Uttle clay 6 



e. Yellow clay 1 



d. Green sand, very hard 2 



c. Loose sand, black pebbles 4 



b. Blue clay 3 



a. Sand and black pebbles 12 



18J 



At Osborne-street, near the above, chalk was found about 26 to 30 feet lower, 

 through a bed of fine white sand {Thanet Sands). — Dr. il. 



Stratum^, ii. may possibly be the Basement-bed of the London 

 Clay. 



Well-section, Kirk and Bycks\ Oshorne-place, Whitechapel. 

 (PI. I. Diag. A, Loc. sect. 22.) 



(Dr. MitcheU's MSS. vol. iv. p. 50.) 



Feet. 



Mould and soil 6 



Yellow clay 6 



Gravel 12 



p. f A. Yellow clay 1 



"■ I a. Blue clay 95 



'h. Yellow-red clay 6 



g. Sand 1 



/. Yellow-red clay 12 



II. Woolwich and J e. Green sand 5 



Reading Series, \ d. Yellow-red clay 10 



bA^feef. I c. Sand 3 



I b. Gravel rock, very hard 9 



{_a. Green sand and black pebbles 8 



III. Thanet Sands. Sand 16 



London 



190 



Chal/c 7wt reached. 



Judging from some adjoining wells, I think that d. ii. is wrongly 

 described, and that it represents the Woolwich shell bed. 



