1856.] WRIGHT UPPER LIAS SANDS. 



Fig. 2. — Section of Frocester Hill, near Stonehouse. 



303 



a, b, c. Inferior Oolite ; 70 feet. 

 D, B. Calcareo-ferruginous sandstone (Cephalopoda-bed) ; 6 feet ") 



F. Yellow and brown sands, with inconstant and concretionary V" Upper Lias Sands." 



bands of calcareous sandstone ; 1 50 feet ? J 



G. Upper Lias shale ; 80 feet. 



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



and nodules of ferruginous sandstone ; 150 feet. 

 I. Lower Lias shale. 



Inferior Oolite. 



Ft. in. 



a. 



h. 



A fine-grained oolitic limestone, similar to the freestone of 

 Birdlip, Painswick, and Leckhampton Hills ; the upper 

 beds exhibit a most remarkable example of oblique bed- 

 ding, the flaggy layers of which rest horizontally on in- 

 chned beds of freestone : thickness about 50 



A coarse, hght-cream-coloured, gritty, crystalline oohte, 

 traversed at intervals by shelly layers extremely crystal- 

 line ; a great part of the rock appears to be composed 

 of the fragments and plates of Crinoidea, the plates and 

 spines of Echinidce, and comminuted fragments of the 

 shells of MoUusca. This white rock has a most remark- 

 able lithological character, and glistens briUiantly 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 discloses numerous mi- 

 croscopic objects; the rock is in fact almost entirely 

 composed of organic debris. It measures about 10 



c. A hard, fine-grained, ooHtic, sandy limestone, of a hght- 



brown colour, lithologically dififerent from b. It contains 

 many fossil shells, which are extracted with difficulty ; 

 and passes into a hard yellow oohte with few fossils : 



thickness from 8 to 10 

 [The lithological character of this rock is very different 

 to that of d, on which it rests.] 



The Cephalopoda-bed — Upper Lias. 



d. A coarse, dark-brown, calcareo-siliceous rock, full of small, 



dark, flattened grains of hydrate of iron. It contains 

 an immense quantity of fossils, but Ammonites and Be- 



