26 W. WHITAKEE ON SOME BOEINGS IN KENT. 



5. On some Boeings in Kent. A Conteibtjtion to the Deep-seated 

 Geology of the London Basin. By William Whitakee, B.A., 

 F.G.S., Assoc. Inst. C.E. With Pal^ontological Infoema- 

 TioN by G. Shaeman, Esq., and E. T. N'ewton, Esq., E.G.S. 

 (Bead December 2, 1885.) 



[Communicated by permission of tlie Director General of the Geological 



Survey.] 



[Plate III.] 



Contents. 



A, Introductory Statement. 



B. Details of the Eorings. 



1. Chatham Dockyard Extension, Well Wo. 1. 



2. Chatham Dockyard Extension, Well 'No. 2. 

 3 Frindsbury, Whitewall Cement Works. 



4. Erindsbury, Chattenden [Barracks. 

 6. Boxley Grange, South of Chatham. 



6. Chartham, South of Canterbury. 



7. Dover. 



0. Geological Results of the Borings. 



D. General Remarks on the Deep-seated Geology of the London Basin. 



E. Explanation of the Map and Section. 



A. Inteodtjctoet Statement. 



An account of the well at the Cbatham Dockyard Extension 

 Works, to the depth of 268 feet, was given, in 1872, in the 

 " Memoir on the Geology of the London Basin " *. Since the pub- 

 lication of that work the boring has been continued, through the 

 Chalk and the Gault, to the Lower Greensand, and a second boring 

 has been made to a little greater depth, with the unexpected result 

 of reaching Oxford Clay. 



It will be of interest therefore to give a full account of these 

 borings, of which only short notices have yet appeared t, and to 

 review the bearing that the result of the later one has on our 

 knowledge of the underground formations of the London Basin. 



The borings are about 210 yards westward of the Factory Basin, 

 in what was, until the extension of the docks was made, the marsh 

 on the southern side of the former St. Mary's Creek, that creek 

 having also been included in the new dockyard. The surface of the 

 ground is about ten feet above Ordnance Datum. 



The earlier boring, which reached Lower Greensand at a depth 

 of over 903 feet, being of small size, in the lower part at all events, 

 it was resolved to put down another and larger one near by, in. 

 order to get a large amount of water from the Lower Greensand ; 



^ ' Geological Survey Memoirs,' vol. iv. p, 459. 



t Of the first boring, in the ' Guide to the Geologj' of London and its Neigh- 

 bourhood,' ed. 3, p. 19 (1880), and of both in ed. 4 of that httle work, pp. 19, 

 21 (1884). The later boring has also been noticed in the abstract of a paper 

 (substantially the same as this) read to the British Association at Aberdeen, 

 which has appeared in various journals. 



