PROCESTER HILL. 



115 



Fig. 5. — Section of Frocester Hill, near Stonehouse, between Gloucester and Bristol, 



Midland Railway. 





Harpoceras Murchisovm. 

 Harpoceras opalinum. 



Lytoceras jurense. 



Harpoceras bifrons. 



Harpoceras serpentinum. 



o ^^^ 



A Amaltheus margaritains. 





a, b, c. Inferior Oolite ; 70 feet = zone of Harpoceras Murchisonce. 



( zones of Harpoceras opali. 

 D, E. Calcareo-ferrueinous sandstone (Cephalopoda bed) ; 6 feet < 



C num. and Lytoceras jurense. 



F. Grey, yellow and brown sands, with inconstant and concretionary bands of calcareous 



sandstone ; 150 feet ? = zone of Harpoceras bifrons. 



G. Upper Lias shale ; %^ {teX^zon^ai Harpoceras serpentinum. 



H. Marlstoue ; hard calcareous sandstone, resting on brown and grey sands, with bands and 

 nodules of ferruginous sandstone ; 150 feet = zone of Amaltheus margaritatus. 

 I. Middle Lias shale = zone of Aegoceras Henkyi. 



Inferior Oolite. 



Ft. in. 



A fine-grained oolitic limestone, similar to tlie freestones of Birdlip, Painswick, and 

 Leckhamptou Hills; the upper beds exiiibita most remarkable example of oblique 

 bedding, the flaggy layers of which rest horizontally on inclined beds of freestone ; 

 thickness about 50 



A coarse, light, cream-coloured, gritty, crystalline oolite, traversed at intervals by 

 extremely crystalline shelly layers ; a great part of the rock appears to be com- 

 posed of fragments and plates of Crinoidal plates and spines of Echinidce, and 

 comminuted fragments of the shells of Mollusca. This white rock has a most 

 remarkable lithological character, and glistens brilliantly when lit up by the sun's 

 rays. The shelly and pisolitic seams which traverse this bed resemble those in the 

 Pea-grit. The surface of weathered slabs exposes numerous microscopic objects ; 

 the rock, in fact, is almost entirely composed of organic dibris, and measures about 10 



A hard, fine-grained, oolitic, sandy limestone, of a light brown colour, lithologically 

 different from b. It contains many fossil shells, which are extracted with diffi- 

 culty, and passes into a hard yellow oolite with few fossils, attaining a thickness 



of from 8 to 10 



[The lithological character of this rock is very different to that of </, on which it rests.] 



