B. TATE OX THE LIAS ABOUT RADSTOCK. 



497 



Section,Quarry near Clan-Down Colliery. 



No. of bed. Description of strata. Thickness. 



ft. in. 



6. (b) Conglomeratic base of the Middle Lias. 



7. (/) Dark clay (No. 10, Eadstock section) having as a base a "] 



8. (g) Sandy layer with quartz pebbles and phosphatic nodules. I 10 



Spiriferina Walcotti, Ammonites obliquecostatus. j 



9. f Yellowish sub crystalline gritty limestone. Ostrea arcuata, 



(h) \ Cidaris Edwardsii 1^ 



10. [ Cream-coloured earthy limestone 1 2 



11. Laminated calcareous sandy shale 2 



12. Reddish yellow subcrystalline limestone in 2 blocks. Pleuro- 



tomaria similis, Astarte obsoleta, Danker, Ostrea arcuata. 7 



13. Grey, splintery, hard limestone 10 



14. Bubbly limestone 8 



15. Soft, white, fine-grained limestones 3 6 



The fossils of the Spiriferina bank are :- 



Strophodus, sp. 



Ammonites Bucklandi, Sow. 



Conybearei, Sow. 



Sauzeanus, B Orb. 



Scipionanus, B' Orb. 



— — obliquecostatus, Zieten. 

 *Lima hettangiensis, Terq. 



gigantea, Sow. 



peetinoides, Sow. 



* ■ succincta, Schloth. 



*Pinna Hartmanni, Schloth. 



Pholadomya glabra, Agassiz. 



ventricosa, Ag. 



Nautilus striatus, Sow, 



Belemnites infundibulum, Phill. 



grandaevus, teste Phillips, 



Cryptsenia solarioides, Sow. 



Cerithium verrucosum, Terq. ? 



Ostrea arcuata, Lamlc. 



Pecten calvus, Gold/. 



Thiollierei, Bumort. 



textorius, Schloth. 



Unicardium cardioides, Phillips. 

 *Cardinia Listeri, Sow. 



Pleuromya crassa, Ag. 



Hasina, Schloth. 



Waldheimia sarthacensis, B Orb. 



Terebratula punctata. 



Rhynchonella plicatissima, Querist. 



variabilis, Schloth. 



Spiriferina Walcotti, Sow. 

 * rostrata. 



Neurofungia mammillata, Be From. 



Proboscina, sp. 



Myoconcha oxynoti, Quenst. (Bath 

 Mus.) 



Ammonites-oxynotus Series. — The Foraminiferal clay(No. 10 Bad- 

 stock section) which overlies the Spiriferina bank, exhibits at Bad- 

 stock no decided stratification, but indicates rather a heaping together 

 of the mass and not tranquil deposition ; its upper surface is irregular, 

 but somewhat levelled up by an accumulation of a ferruginous gravel 

 in its depressions. At Medyeat, north of Camerton, the clay is simi- 

 larly a confused mass with an undulating upper surface, strongly 

 marked by the waving course of a thin limestone cover. In the 

 Bowldish and Timshury sections this clay is regularly bedded; and in 

 each we attain to a higher level in the Oosynotus beds than in the 

 other sections. The variation in thickness of the Foraminiferal clay 

 within a few square miles is remarkably great ; at Medyeat it is 

 from 7 to 8 feet, at Timsbury 5 feet, at Bowldish 2 feet 2 inches, at 

 Radstock 1 foot 10 inches, at Clan Down 10 inches, probably reduced 



Collected by Mr. Tawney. 



2l2 



