ON THE LIAS BEOS NEAR CFIELTENHAM. 



21 



The remains of vegetable substances also occur, together 

 with those of animals ; the wood is mostly in the form of 

 lignite of a black colour, but so broken that it is impossible 

 to discover the species of plants of which it is formed. Pro- 

 fessor Sedgwick, in whose company we found several speci- 

 mens, distinctly stated several of these remains to have be- 

 longed to the genus Conifers. 



The following is a list of the principal shells, etc. found in 

 this formation : 



Univalves, ten species — MuLTiLocuLAR-5e/e?//m/e5 (1) — 

 Nautilus (1) — Ammonites {12) —CrmGidea Ptntacrmus{\) — 

 Bivalves — Pecten (4) — Plagiostoma (4) — Lutraria (3) — 

 Ostrea (2) — PUcatula (1) — Cardium{2J. 



IIT. The Upper Lias or Alum Shale. 



This formation rests immediately upon the bed of marl- 

 stone just described, and forms the upper stratum of the 

 two hills of Dumbleton and Churchdown ; it is of a light 

 blue colour, one hundred feet in thickness, and contains 

 large concretionary masses of lias of a blue colour, con-~ 

 choidal fracture, and traversed by veins of carbonate of 

 lime. 



It contains abundance of Ammonites communis. The 

 upper lias is also traversed by a seam of hard stone, ten 

 inches thick, containing the remains of fishes of the Sauroid 

 family. 



The following is an admeasurement of the beds forming 

 the upper has formation and marlstone beds of Dumbleton 

 Hill by George Kleigh, Esq. : 



ft. in. 



1. Vegetable mould . . . . . .10 



2. Stone coloured clay . . . . .20 



3. Dark brown clay . . . . . .30 



c 2 



