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. 
III. Secondary Period, continued. 
Carboniferous Group. f 1 
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 Herefordshire, Brecknockshire, 
Dumfriesshire, Forfarshire. 
Silesia, Bohemia. 
4. Grauvtacke 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. 
