part 1] SECTION AT WOEMS HEATH. 13 



puddingstone of Hertfordshire should turn out to belong to it : this,, 

 however, is rarely seen in place. 



At Middleton, by the border of Essex and Suffolk, a sandy 

 pebble-bed, which seems to have been dug for gravel, may repre- 

 sent the Blackheath Beds ; l while at Ipswich a very narrow 

 outcrop of sand, with some pebbles, has been classed with the Old- 

 haven Beds. 2 



North of the broad outcrop of East Surrey and West Kent the 

 evidence of wells does not point to the extension of the Blackheath 

 Beds underground far from their outcrop. The following are the 

 only cases in which even a suggestion of the occurrence of this, 

 division has been noted : — In Surrey, where the sandy form is the 

 more usual underground, in two wells at Bermondse}', in one well 

 at Brixton, in six wells at Croydon (very near the outcrop, and in 

 one case in considerable thickness), in one well at Norwood, in two 

 wells at Penge, and in one well at Sydenham. 3 



In Kent the outcrop of the uppermost member of the Lower- 

 London Tertiaries comes much nearer to the northern boundary of 

 the county ; in great part, indeed, up to and across it; but there are 

 several records of its presence, mostly in the Oldhaven form, under 

 the London Clay, in wells where that formation is more than 

 100 feet thick, as at Allhallows, Eastchurch, the Isle of Grain 

 (two), Lewisham, Minster (in Sheppey, three), Sheerness (three)* 

 and Upchurch. 4 



Moreover, the outcrop crosses the Thames into a small part of 

 Essex, and along the southern part of that county the occurrence 

 of this division (largely in its sandy form) has been recorded or 

 suggested in the description of very many deep Avells, often below 

 a great thickness of London Clay, at the following places : — 

 Abberton, Abbess Boding, Barking, Barling, Billericay, Bowers. 

 Gilford, Brentwood, Broomfield, Burnham, Canvey, Chelmsford, 

 Corringham, Downhain, East Ham, Eastwood, Fobbing, Foulness,. 

 Great Baddow, Great Wakering, Harwich, He} r bridge, Hornchureh,. 

 Horndon, Ilford, Ingatestone, Leyton, Maiden, Margaretting, 

 Mundon, North Fambridge, Pitsea, Painham, Shoeburyness, South- 

 end, Stanford-le-Hope, Stisted. Vange, vValthamstow, West Ham,, 

 and Wickford. 5 Besides these, many other Avells have probably 

 passed through some representative of this division, though with 

 the information to hand one hardly felt justified in using the name*. 



1 ' The Geology of Part of N.W. Essex, &c." Mem. Geol. Surv. 1878, p. 24. 



- ' The Geology of the Country around Ipswich, &c.' Mem. Geol. Surv. 

 1885, pp. 15, 16. 



* ' The Water Supply of Surrey * Mem. Geol. Surv. 1912, pp. 114, 115. 123. 

 140-143. 145, 148, 203, 209, 240. 



4 ' The Water Supply of Kent ' Mem. Geol. Surv. 1908, pp. 73, 123, 143. 

 144. 160, 170, 192, 194-196, 211. 



5 • The Water Supply of Essex' Mem. Geol. Surv. pp. 86. 92, 95, 101, 105. 

 107. 110. 112. 114,115. 132 134. 140. 143. 144. 147149. 159-161, 175, 176. 

 184. 191. 193 195. 197, 199 201, 219-222. 233. 237. 242-244, 251, 258, 260, 

 262 264. 266, 274, 285, 286, 293, 300, 301, 310. Although bearing- the date 

 1916. in the middle of which year it was printed off, the issue of this Memoir 

 was put off during ihe War. so that it was not in the hands of the public: 

 until late in 1918. 



