128 PROF, J. PRESTWICH ON THE RELATION OF THE 



Esse:i\ — On the south of the Crag area, the well-known cliffs at 

 Walton-on-the-jSTaze exhibit a small patch of the Westleton Beds, 

 composed of : — 



per cent. 



1. Mint-pebbles 36 



2. White quartz-pebbles 20 



3. Subangular flints 20 



4. Subangular chert 14 



5. Quartzites, Lydian stone, &c 10 



100 



This gravel caps the cliffs near their western extremity, over- 

 lying a bed seemingly of the Chillesford Clay *. At the eastern 

 end of the cliif, the unproductive sands are replaced by very^fos- 

 siliferous beds of the Eed Crag. 



Pig. 4. — Section of Cliff east of Walton-on-tTie-Naze. 



feet. ^ 



a. Surface-soil and gravel 1 to 2 



c. Westleton Shingle 5 



, f Light-coloured laminated sands and clajs 4 



* \ Dark carbonaceous clay with mvieh wood and lignite 2 



e. White and yellow sands. These are replaced at the other end 



(east) of the cliff by fossilif'erous Eed Crag 10 



/. London Clay. 



From Walton to Clacton the low cliffs consist of London Clay 

 capped by gravel. There are no Crag Beds. This gravel forms 

 apparently one thick bed (12 to 20 ft.), but in reality it consists of 

 two parts. The upper bed is much disturbed and not stratified, and 

 is derived in considerable part from the debris of the lower bed ; 

 whereas the lower one is regularly stratified, and often shows well- 

 marked false-bedding. It may be a question whether, although 

 both the Eed Crag and the Boulder-clay are absent in these cliffs, the 

 lower gravel should not be referred to the Westleton Shingle. That 

 there is a material difference of age between the two beds of gravel 



* Mr. Clement Reid considers it to be something newer. 



