90 



CARBONIFEROUS GROUP. 



1 . Coal Measures, 

 Terrain Houillier. 

 Kohlengebirge 



CAEBONIPEEOUS GROUP 



2. Millstone Grit 



Kohlensandstein. 



3. Carboniferous Limestone. 

 Calcaire Carbonifere . . 

 TJeberganskalk .... 



The Carboniferous Group, consisting of a series of beds 

 of Sandstone, Grit, Clay, Shale, Coal, Limestone, with 

 layers of Chert and Ironstone, has been divided into the 

 Coal Measures, Millstone Grit, and Carboniferous Lime- 

 stone. This triple arrangement becomes considerably 

 modified as we proceed towards the north of England and 

 Scotland, for in Derbyshire and Yorkshii-e, the true coal- 

 bearing strata do not cease with" the millstone grit, but are 

 intercalated with it, and in Yorkshire the limestone (Yore- 

 dale Eocks) contains several coal seams, flagstone, iron- 

 stone, &c., and still further northwards, in Northumberland 

 and the south of Scotland, the lower limestones become 

 frequently divided by intervening beds of grit, shale, and 

 coal. The following short summary is abstracted from 

 Professor Phillips. 



South of England 

 and South Wales. 



Coal Formation. 

 Millstone Grit. 



[not very thick) 

 Mountain Limestone. 



Old Red Sandstone. 



Derbyshire. 



Coal Formation. 

 MiUstone Grit. 

 Limestone Shale. 

 Mountain Limestone. 

 Old Red Sandstone. 

 {not much developed.) 



Yorkshire. See. 

 Coal Formation. 

 Millstone Grit. 

 Yoredale Rocks. 

 Scar Limestone. 

 ■• Alternations of Red 

 Sandstones, Clays, 

 and Limestone. 

 Red Sandstone and 

 Conglomerate. 



