B. TATE ON THE LIAS ABOUT BADSTOCK. 495 



Section, Old Fit Quarry near Radstoclc. 



Note. The Italic characters prefixed to the strata in the several sections in- 

 dicate that they are identical or correlative. 



No. of bed. Description of strata. Thickness. 



ft. in. 

 6. Conglomerate base of the Middle Lias. 

 ( 7.(d) Blue clay 3 



8. (e) Black-blue gritty limestone (weathering russet-co- 

 loured). Fish-scales, Ammonites subplanicosta, Op- 



\ pel, Waldheimia sarthacensis 4 



9. (/) Layer of brown hasmatite pebbles in sandy clay, of va- "j 

 riable thickness, filling irregularities of surface of ll 10 



10. (/) Black clay, irregularly bedded J 



/ll. (g) Sandy layer, with black nodules, full of Spiriferina 



Wa Icotti 6 



° ^ ■{ 12. (A) Pepper-and-salt-coloured gritty limestone in two 

 § § I blocks. Bpiriferina, Bhynchonellce, Pecten Thiol- 



cgflq V lierei,&c ! 1 1 



( 13. Gritty limestone 4 



14. (i) Id. Lima qiqantea, Ostrea arcuata 1 6 



15. ■ Id ^1 5 



16. Id 9 



17. Id 6 



18. Blue gritty limestones 4 7 



19. Blue limestone. Amm. Johnstoni, Lima gigantea 11 



20. Id 7 



21. Id 3 



v 22. Ten beds of blue limestones 5 5 



^ CO 



sl 



IS3 ° 



^3 



I s ! 



ll 



The beds known as the " Grey Lias," embracing beds Nos. 22-13 

 of the foregoing section, have been placed by Mr. Moore on the 

 horizon of Ammonites Bucklandi; and that author asserts that the two 

 lower zones of A. angulatus and A. planorbis are altogether wanting. 

 Though I have not worked long enough at these beds to arrive at a 

 full decision as regards the whole mass, yet from the partial palaeon- 

 tological facts obtained and a coup d'oeil, I have no hesitation in re- 

 ferring a considerable portion of them to the A.-angulatus and A.- 

 planorbis series. Ammonites Johnstoni, which invariably occurs in the 

 lower A.-angulatus beds and on the confines of the A.-angulatus and 

 A.-planorbis zones, is present in the middle part of the " Grey Lias " 

 beds. Its position is given in the above section ; whilst in a quarry 

 on the Wells road I have found Ammonites planorbis, with Phola- 

 domya glabra, Pinna Hartmanni, Lima hettangiensis, and Ostrea 

 semiplicata^ in lower beds, which in their turn are underlain by flaggy 

 limestones or " firestones " the surfaces of which are crowded with 

 Ostrea liassica. 



As we pass upwards in the Kadstock section, the limestones gra- 

 dually acquire a more and more siliceous property, which reaches a 

 maximum in the bed No. L2. This highly fossiliferous stratum, and 

 the overlying sandy beds, are undoubtedly on the horizon of A. Buck- 

 landi, as they contain the dominant Ammonite and a few of its com- 



Q. J. G. S. No. 123. 2 l 



