DRIFT-STAGES OF TEIK DIUIINT VAIJ.KV. 143 



the patch of gravel on the northern slopes of Oldbury at the level a 

 little above 400 feet, and that on the hill north-west of Seal at about 

 30i > feet *, which seem to belong to this stage. Flint implements 

 occur with both. 



A better marked case which I have since had occasion to observe 

 occurs at West Yaldham, near the east-lodge entrance to the 

 grounds of St. Clere (PL VI., fig. 2), at the heiglit of about 430 feet. 

 The ground is there thickly covered with gravel (the depth not 

 known), consisting of: — 



1. White augular and sHghtly subangulur flints. 



2. Some flints of very large size. 



3. A few brown-stained subangular flints and Tertiary flint-pebbles. 



4. A very few subangular fragments of Cliert, Ragstone, and Iron-sand- 



stone. 



Some fragments of the Oldbury-Hill stone, and a broken piece of 

 a Palaeolithic implement of the flat ovoid form, together with a 

 scraper of the Ash type t, have been found here by Mr. B. Harrison. 

 This bed, with that on the flanks of Oldbury, seems to mark the 

 watershed between the Darcnt and the Shodc ; but whereas the 

 centre of the watershed at Limpsfield between the Darent and the 

 Oxted stream is capped by the gravel, it has here been removed 

 from the centre, and only the lateral ends of the bed remain. 



Again, in a field between Otford and Kemsing, and at a height of 

 300 to 330 feet |, there is a patch of gravel composed mainly of 

 angular and subangular white flints, with a few brown-stained worn 

 flints and Tertiary flint-pebbles, and very few fragments of Chert 

 and Eagstone. This bed lies on a spur of the Chalk at the base of 

 the escarpment below Beechy Lees. 



The more contracted valley through the Chalk north of Otford, 

 on which we now enter, has been so entirely denuded that few 

 traces of the older drift-beds remain. 



The best marked outlier is above the paper-mills at Eynsford, on 

 the right bank of the river, close on the 200-feet contour-line, 

 whence it extends to the height of 220 or 230 feet. A small cutting 

 on the lane-side shows a section of this gravel 4 to 5 feet deep, 

 roughly bedded, and consisting of Chalk flints, Tertiary pebbles, sub- 

 angular fragments of Chert, Eagstone, and Ironstone (L.G.S.), with 

 a few old brown-stained flints. The bed extends northwards towards 

 Beesfield, and reappears on the slope of the hill east of Parning- 

 ham, where it maybe seen in the bank on the roadside at about the 

 same level. The distance between this spot and Broughton Hill 

 being o-\ miles, and the diff'erence of height 137 feet, gives a gra- 

 dient of 25 feet per mile, an increase probably connected with the 

 more contracted valley-channel and a greater velocity of the 

 stream. 



* ' Geology of the Weald,' p. 191. 



t This is in all probability derived from the plateau-di-ift. 



\ From the same level, in the grounds of Wildernesse, near Seal, Mr. Craw 

 shay has two porcellanoue-kokiug small implements, well shaped, with the edges 

 sharp and uninjured. 



l2 



