FROCESTER HILL. 115 



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



Midland Railway. 



Harpoeeras Murchisonai. 

 Horpoceras opalinum. 

 _,.--,, Lijtoceras jurense. 

 ^ Harpoeeras bifrons, 



^ Hfirpoceraft ierpentimtm. 



_ _^ __ -ij^^- ' \ '^t^^ tr'~'^^ —^^ Amaltheus margaritatus 



-^z^_--- . _ S^ ^ — ^-'^^ -. ^~_^ ___-^rJ^ ^— - ~T - Aegoceras Henley i. 



I 

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



( zones of Harpoeeras opali- 

 D, E. Calcareo-ferrueinous sandstone (Cepnalopoda bed) ; 6 feet -j , , 



t num and Lytoceras jurense. 



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



sandstone ; 150 feet ? = zone of Harpoeeras bifrons. 



G. Upper Lias shale ; SO feel = zone o! Harpoeeras serpentinum. 



H. Marlstone ; 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 Aegoeeras Henleyi. 



Inferior Oolite. 



A fine-grained oolitic limestone, similar to the 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 difli- 

 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 ot d, on which it rests.] 



