392 



ORDER OF THE SUPERPOSITION OF 



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. 



Lias (marine). Blue, white, and 

 yellow earthy limestone, usually in 

 thin beds, interst ratified with clay, 

 often slaty and bituminous. 



Dark blue marl, with a few irregu- 

 lar rubbly limestone beds saudy 

 marlstone. 



Lyme Regis, in Dorsetshire, and 

 in many parts of Somersetshire, Glou- 

 cestershire, Warwickshire, Notting- 

 hamshire, and Yorkshire in Suther- 

 landshire, the Hebrides, and North of 

 Ireland. 



In France, and, to a considerable 

 extent, in Germany. 



K 



1. Keuper, or variegated marls. 

 Red, grey, green, blue, and white 

 marls, sandstones, conglomerates, and 

 shells, containing gypsum and rock- 

 salt. 



Neighbourhood of Vosges moun- 

 tains, and many parts of Wurtemberg 

 and Westphalia, and other parts of 

 Germany. 



2. Muschelkalk (marine). Grey, 

 blue, and blackish limestone, with 

 many fossils, particularly encrinites ; 

 siliceous layers and nodules ; magne- 

 sian limestone, marls of different co- 

 lours, gypsum, and rock-salt. 



Extensively developed in Germany 

 and Fiance. Hitherto no beds in Eng- 

 land have been identified with the 

 formation. 



3. Variegated sandstone. Red, 

 white, blue, and green siliceo-argilla- 

 ceous sandstone, often micaceous, and 

 containing gypsum and rock-salt. 



Nottinghamshire Yorkshire. It 

 is uncertain whether the variegated 

 sandstone of England belongs to the 

 Keuper formation of Germany, or to 

 the variegated sandstone which lies 

 under the Muschelkalk in Westphalia, 

 Wurtemberg, the Vosges, &c. 



4. Magnesian limestone (marine). 

 Compact shelly limestone, yellow 

 magnesian limestone, marl slate, red 

 marl, and gypsum. 



Nottinghamshire, Derbyshire,York- 

 shire, Durham, Northumberland. 



Departments of Saone and Loire, 

 Hartz mountains, Thuringia, West- 

 phalia. 



5. Red conglomerate. Sandstones, 

 conglomerates, sands, and marls. 



Neighbourhood of Exeter York- 

 shire Durham Westphalia Wur- 

 temberg Vosges mountains. 



