THEORY OF THE EARTH. 



249 



TABLE of Geological Formations in the order of their 

 superposition. By M. Al. de Humboldt. 



Alluvial Deposits. 



Lacustrine Formation with Buhrstones. 



Fountainbleau sandstone and sand. 



Gypsum with bones. Siliceous Limestone. 



Coarse Limestone. 

 (London Clay.) 



Tertiary sandstone with lignites. 



(Plastic clay, Molasse, Nagelfluhe.) 



Chalk. 



white. 



tufaceous. 



chloritic. 



Ananchites. 



Green sand. 

 Weald clay. 

 Iron Sand. 



(Secondary Sandstone with lignites.) 



Ammonites. 

 Planulites. 



Jura Limestone. 



Quadersandstein, or white sandstone, 

 sometimes above the lias. 



Slaty beds with fishes and 

 Crustacea. 



Coral rag. 

 Dive clay. 

 Oolites and Caen 

 limestone. 



Muschelkalk. 

 Ammonites nodosus. 



Marly or calcareous lias 

 with Gryphaa arcuata. 



Marls with fibrous gypsum. 

 Arenaceous beds. 



Saliferous variegated sandstone. 



Productus aculeatus. 



Magnesian limestone. 



Zechstein. 

 Copper slate. 



(Alpine limestone.) 



JQuartziferous 

 Porphyry. 



Co-ordinate formations of porphyry, red 

 sandstone, and coal. 



Transition Formations. 



Slates with Lydian-stone, greywacke, diorites, euphotides. 

 Limestones with orthoceratis, trilobites and euomphalites. 



Primitive Formations. 

 Clayslates (Thonschiefer), 

 Micaslates. 

 Gneiss. 

 Granites. 



