London 



PRESTWrCH WOOLWICH AND READING SERIES. 14] 



Well-section, Balham Hill, near Clapham Common. 

 (Dr. Mitchell's MSS. vol. iv. p. 205*.) p^g^ 



Mould 1 



Yellow clay 4 



Saud 4 



Gravel 6 



pj J b. Brown clay 6 



^^'^y-\ a. Blue clay or burl 233 



i. Oyster-shell rock 5 



h. Brown clay 13 



g. White clay ; 4 



Woolwich f. Yellow clay 3 



and Reading^ e. Red clay 2 



Series, bZft. <?. Light blue clay 5 



c. Black clay 3 



b. Brown clay 13 



a. Pebble-stones 5 



Thanet Sands. Sand 40 



347 



Well-section, York-mead, Lambeth. 

 (Pari. Report, " Supply of Water in the Metropolis," 1828, p. 111.) 



Feet. 



Made ground, gravel, and clay 30 



Stony blue clay {London clay) 139 



, rClaystone O^ 



■■ "[ Hard rock 1^ 



{Hard mixed clay and sand 20 

 Shell and pebble stones 6 

 Green soft sandstone came up in sand 14 



211 

 The complete suite of specimens preserved by Mr. A. K. Barclay 

 enables me to give the following section in greater detail than usual. 

 It establishes the important fact of the well-marked local occurrence 

 of the Ostrea Bellovacina at the base of Group ii. {a, h.), and shows 

 clearly the Woolwich shell bed {g) placed between two considerable 

 masses of mottled clays. 



Well-section, Barclay and Perkins s Brewery, Southwark. 



Feet. 



Made ground and silt with vegetable remains 20 



Grey clayey sand with specks of phosphate of iron 1 



Gravel 6^ 



Carried forward 27^ 



* Although the publications on Tertiary Geology of the late Dr. James Mitchell 

 are not numerous, he was an indefatigable observer and collector in this field, 

 and was ever ready to assist others unreservedly with his facts and profusely with 

 his specimens, as I can testify from personal experience. On many points his 

 views were often peculiar, and not in conformity with prevailing opinions ; but 

 his convictions were always honest and boldly expressed. He has left five folio 

 MS. volumes of valuable rough notes on the Geology, Botany, and Wells of the 

 neighbourhood of London. These are now in the possession of liis nephew Mr. 

 James Templeton of Exeter, who has been good enough to allow me the free use 

 of them. This and several other well-sections are from this MS. work. 



l2 



