240 Tlie Nen- Forest : its History and its Scenery. 



It is a bed, however, which is seldom open, and can be 

 worked only at particular tides. It may easily be recognized as 

 lying between the Leaf Bed and the well-marked Lignite Bed, 

 which shows the first traces of salt-water, and where, in the 

 lower portion, Neritina concava may be abundantly found. This 

 last bed may be well seen at Beckton Bunny (Section IL). The 

 lignite, however, though it will give a good deal of heat, will not 

 blaze. Locally it is sometimes used for making black paint. 



Section II. of Beckton Cliff immediately to the ivest of the Buniuj. 



Flint gravel — scarcely more than 3 or 4 feet, with 

 an uncertain band of white sand. 



Lignite — 3 inches. 

 Brown clay — 3 inches. 

 Lignite — 3 inches. 



Marl and sand — 2 feet 2 inches. 



Ligneous bed, containing shells much broken — 

 8 inches. 



Grey sand — 2 feet 4 inches. 



Orange-coloured sand, with very lew fossils at this 

 point, though plenty eastward — 15 feet 9 inches. 



Olive bed. Fossils abundant — 27 feet 3 inches. 



The present sea-shore. 



Passing on to Beckton Bunny we reach the first true bed 

 of the Lower Marine Formation, which rises a little eastward of 

 tliat ravine. I have distinguished it as the Olive Bed, from the 

 240 



