THE PRINCIPAL STRATA IN EUROPE, 



393 



TABLE II. continued. 



Periods and 

 Groups. 



Names of the principal Members and general Mine- 

 ral nature of the Formation. 



Some of the Localities where the Formation occurs. 



1 . Coal measures (freshwater ?). 

 Sandstones,grits, conglomerates, clays 

 with ironstone, shales, and limestone, 

 interstratified with beds of coal. 



Northumberland, Durham, York- 

 shire, Lancashire, Derbyshire,Stafford- 

 shire, Gloucestershire, Somersetshire, 

 South Wales, Valleys of the Forth and 

 Clyde. 



District of Liege, Westphalia, Si- 

 lesia, Bohemia, &c. 



2. Mountain limestone (marine). 

 Grey, compact, and crystalline lime- 

 stone, abounding in lead ore in North 

 of England, and alternating with coal 

 measures in Scotland. 



Mendip Hills, Somersetshire, Der- 

 byshire, Yorkshire, Lancashire,' ( West- 

 moreland, Durham, Northumberland, 

 Lanarkshire, Linlithgowshire, many 

 parts of Ireland. 



North-west of Germany, Belgium, 

 North of France. 



3. Old red sandstone. Coarse and 

 fine siliceous sandstones and conglo- 

 merates of various colours, red predo- 

 minating. 



Extensively developed in Shropshire 

 and Ht-refurdshire, Brecknockshire, 

 Dumfriesshire, Forfarshire. 



Silesia, Bohemia. 



4. Grauwacke and transition lime- 

 stone (marine). Coarse and fine 

 slates, sandstones, and conglomerates 

 crystalline limestones. 



Westmoreland, Cumberland, Wales, 

 Somersetshire, Devonshire, South of 

 Scotland, South of Ireland. 



North of France, North-west of 

 Germany, &c. 



