Il6 ON THE GRAVELS NEAR BARKING SIDE, 



j'l. Pebbles in patches up to 2 feet thick, mottled red 

 I and white in places. Two or three subangular 



Drift -: flints, several small quartz pebbles up to \ inch 



longest diameter. 

 1^2. Loamy reddish sand, 4 feet. 



Bagshot ("3. Sand yellow with a layer of white clay i foot. 

 Sand \\. Yellow sand, 2 feet. 



This section was on the patch mapped " Hill Gravel of doubtful 

 age." I should be inclined to call it a I're-Glacial Hill Gravel.^ 



Patches of Boulder Clay and Loam belonging to the Glacial 

 Formation are mapped at Chigwell Row (266 feet O.I).), and on the 

 slopes of the hill below are some small patches of gravel. 



Then we come to the large patch on which Barking Side stands. 

 It is described by Mr. Whitaker {op. cit. p. 410) as one of several 

 detached masses of a high terrace of River Drift " separated from 

 the rather lower sheet to the south by an outcrop of London Clay, 

 partly very narrow." He adds that this " large mass stretches irregu- 

 larly eastward from near the Roding, opposite Wanstead, by Barking 

 Side and Aldborough to the south-eastern part of what used to be 

 Hainault Forest by Padnal Gate, and northward to Fairlop Plain. 

 It seemed as if the London Clay came up through the gravel in 

 places, as half-a-mile and more south-westward of Barking Side, 

 between that village and xVldborough and round Aldborough 

 Gate." 



This gravel is mapped as extending from a level of about 120 

 down to 50 feet above the sea, and there is a gravel pit at Carswell 

 at the lower end of the patch. The section shows some 15 feet of 

 well stratified gravel and sand. Mr. Crouch tells me that the 

 greatest thickness of gravel is 21 feet, and when Mr. T. V. Holmes 

 and I visited the pit on June 15th last, he showed us a place where 

 the London Clay was being dug into below the gravel. Patches and 

 lines of sand, sometimes rather loamy, occur occasionally. Here and 

 there the gravel is slightly contorted and in two or three places small 

 faults, or more probably slips, are to be seen. 



The gravel consists mainly of flint pebbles and subangular flints. 

 I also noted a few fragments of Lower Greensand Chert, some, not 

 very much, small cjuartz, and the following stones which are probably 

 erratics derived from the Glacial Drift : 



I See S. V. Wood, Quart. Journ. Geol. Soc. 1868, vol. xxiv , p. 466; Whitaker. Geol. of Loud. 

 vol. i , p. 297. 



