506 



Geological Society. 



must be attributed many of the strange and misapplied names of 

 animals and organs which occur throughout the pages of this book, 

 which, indeed, does not seem to us to have been worthj- even of 

 this indifferent translation, W. P. P. 



PROCEEDINGS OF LEARNED SOCIETIES. 

 GEOLOGICAL SOCIETY. 



February 7th, 1906.— J. E. ilarr, Sc.D., F.R.S., 

 President, in the Chair. 



The following communication was read : — 



' The Carboniferous Limestone (Avonian) of the Mendip Area 

 (Somerset), with especial reference to the Palseontological Sequence.' 

 By Thomas Franklin Sibly, B.Sc, F.G.S. 



The Avonian rocks are exposed in four main anticlinal forms or 

 pericliues — those of Black Down, North Hill, Pen Hill, and Beacon 

 Hill ; each of which has an approximately east-and-west trend and 

 has Old Red Sandstone exposed in its core. The following is the 

 zonal succession : — 



Zones. 



Subzones ^- Horizons. 



Feet. 



■< I Dihunoijhylliim 

 a Seminida 



l\ 



Si/ringolhyris C . -S'. cuspidafa. 



I /7\ 



Zapkrentis | ^,. Z^ff.cornucopic^ 



^ [ Zj. opirifer an. clathratus. 



( K2. Spiriferina cf. octophcata. 



Ckistopora ■! Kj . Product us bassus. 



I M. {Modiola-T^haae.) 



500 



r D,. Lonsdalia Jloriformis. 

 \ Di. Bibunophyllum 9. 



( S^. Producttis aff. Cora mut. Sj. "1 r.nn 

 \ S■^. P. cf. semireticulaius mut. S^. J 



550 

 } 800 



450 



In the present paper, the faunal sequence is discussed in detail, 

 attention being confined almost entirely to the corals and brachio- 

 pods, which predominate throughout the series. The lithological 

 character of each zone and subzone is treated briefly. The general 



