169 



these places it exhibits certain lithological characters, some of 

 which are present in one locality and absent in another; but 

 throughout the fauna is nearly identical. 



The following section of Frocester Hill, near Stonehouse, 

 affords the best type of the zone : — ^ 



Fig. IV. Section of Fkocestee Hill, near Stonehouse. 



East. West. 



ft. 

 ;, b, c. Inferior Oolite 70 



D. E. Calcareo-femiguious sandstone, Cephalo- 

 poda bed, -4nim(»ij!to qpaZiVms 6 



F. Yellow and brown sands witb inconstant 



and concretionary bands of calcareous 

 sandstone = Am. Jurensis zone 150? 



G. Upper Lias shale = Am. communis zone ... 80 

 H. Marlstone = Am. margaritatus zone. Hard 



calcareous sandstone resting on brown 

 and grey sands, with bands and nodules 

 of ferruginous sandstone 150 



I. Middle Lias shale = Am. capricornuszone... 

 Inferior Oolite. 



a, A fine grained oolitic Limestone, the upper beds 



obliquely bedded, the flaggy layers resting hori- 

 zontally on inclined beds of Freestone 



b. A coarse cream coloured, gritty, crystalline Oolite, 



traversed at intervals by shelly layers ; the rock 

 consists chiefly of the dsbris of Shells, Echinidse, 

 and Crinoids, and glistens brilliantly when sun- 

 lit. It represents the ' ' calcaire d Entroques " 



In . 



I Upper Lias 

 Sands. 



50 



10 



