202 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



British Carboniferous Series Sfc. (continued). 



Essentially 

 Marine. 



Names of Formations. 



E. Gannister Beds, or 

 Lower Coal-measures. 

 Thin coals with hard sili- 

 ceous floors ; flagstones 

 and shales. 

 Fossils (marine) : Fish (mi- 

 gratory) ; Mollusca, Goni- 

 atites, Discites, Orthoceras, 

 Posidon omya , Monotis,Avi- 

 culopecten, Anthracosia, 

 Lingula, &c. 

 Stage D . Millstone- Grit Series. 

 Coarse grits, flagstones, 

 and shales, a few thin 

 coal-seams. 

 Fossils : similar to those 

 of the Lower Coal-mea- 



C. Yoredale Series. 

 Shales and grits, passing 

 down into dark shales 

 and earthy limestones. 

 Fossils (marine) : including 

 Goniatites, Aviculopecten, 

 Ctenodonta, Chonetes, 

 Discina, 

 Productus, &c. 



Essentially 

 Marine 

 (except 

 Stage A 

 in 



Scotland). 



( Stage B. Carboniferous Lime- 

 stone. Massive limestone 

 in many beds with inter- 

 vening shales and grits 

 (thick in the south, thin 

 in the north). 

 Fossils : Fish, Crustacea, 

 Crinoids, Corals, &c. ; all 

 ■{ marine. 

 ~:age A. Lower Limestone 

 Shale and Calciferous 

 Sandstone. Dark shales 

 in some places ; grits, 

 conglomerates, and red 

 sandstone and shales in 

 the northern districts. 

 ^ Fossils (marine). 



Basis. Upper Old Fed Sand- 

 stone. Yellow sandstones 

 and conglomerates. 

 Fossils (freshwater) : not 

 well represented in Eng- 

 land. 



Localities. 

 South Lancashire, North Staf- 

 fordshire, North and South 

 Wales. 



Uplands of Yorkshire, Lanca- 

 shire, and Derbyshire, N. 

 Staffordshire, and N. and 

 S. Wales. 



Uplands and valleys of Lanca- 

 shire, Yorkshire, Derby- 

 shire, North Staffordshire, 

 Wales, &c. 



North and South Wales, Derby- 

 shire, Yorkshire, Cumber- 

 land ; in Scotland the 

 Lower or Main Limestone. 



>uth Wales, Gloucestershire 

 and Somersetshire, Nor- 

 thumberland and Durham ; 

 in Scotland, Calciferous 

 Sandstone series. 



South Wales, Northumberland, 

 Scotland (Dura Den), Ire- 

 land (Kiltorcan). 



The above stages contain, in all, about 500 genera and 2400 

 species. I purpose showing their numerical value and relation one 

 to the other in the passage of the species through the 8 horizons 

 or stages to the close of the Carboniferous period. The connexion 

 of the Permian rocks with the Carboniferous is not an easy task, 



