296 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 9, 



cardiiformisy Sow., L. Iceviuscula ?, Sow., Natica LeckhamptonensiSy 

 Lye, Natica adducta, Phil., Mytilus pectinatus, Sow., Astarte ele- 

 gansy Sow., Nerincea, sp., Chemnitzia, sp., and masses of Coral, 

 chiefly Thamnastrcea Mettensis, Edw. This bed was deposited 

 under different conditions to that of the freestone on which it rests, 

 as its lower portion is slightly brecciated ; and the surface of the 

 freestone on which that breccia was deposited had been for some 

 time exposed to aqueous action and made smooth thereby. The 

 marl measures about 7 feet in thickness, and passes upwards into a 

 marly limestone, becoming oolitic in the uppermost layers. This 

 division of the bed is about 10 feet thick. The Fimbria-bed is a 

 constant feature in the Inferior Oolite of the Cheltenham district. 



No. 6. The Freestone is a compact light-coloured oolitic limestone ; 

 the uppermost beds are the best for building-purposes ; the middle 

 beds are of an inferior quality, and are stained in part with the 

 peroxide of iron ; the lower beds contain large oolite-grains, and are 

 called "roestone " : the freestone in all is about 110 feet in thick- 

 ness. 



in. 



The Pea-grit {Inferior Oolite) . p^ 



A. A brown, coarse, rubbly oolite, full of flattened concretions 



cemented together by a calcareous matrix. When the 

 blocks weather, the concretions, which resemble flattened 

 peas, form a very uneven surface. It contains many 

 fossils in good preservation 12 



B. A hard, cream-coloured, pisolitic rock, made up of flat- 



tened concretions, with a thickness about similar to 



those in A 10 



c. A coarse, brown, ferruginous rock, composed of large ooli- 

 tic grains ; it is readily disintegrated by the frost, and 

 is of little economical value. About 20 



The Cephalopoda-bed {Upper Lias), 



D. A brown marly rock, full of small dark oolitic grains of 



the hydrate of iron, which are strewed in profusion in a 



calcareous paste. About 2 



d'. a thin seam of yellowish sand 1| 



E. A dark-grey crystalline limestone, extremely hard, and re- 



sembling some beds of the carboniferous limestone ; it 

 is bored in diff'erent places by Fistulana ?, the shells of 

 which remain in the excavations 9 



F. A brown, argillaceous, sandy bed, full of micaceous parti- 



cles ; passing downwards into fine brown and yellow 

 sands. Thickness unknown. 



G. Upper Lias Clay, of a dark blue colour. Thickness pro- 



bably 160 



Fossils of the Pea-grit {Inferior Oolite) — a, b, c. 



As this bed is very much the same, lithologically and palaeonto- 

 logically, as the Pea-grit of Cleeve, Crickley, and Birdlip Hills, I 

 shall give a list of its most abundant fossils in my next section of 

 Crickley Hill. 



