AEEANGEMEFT OF THE STEATA. 115 



THE TEETIAEY STEATA. 



II. A vast accumulation of various deposits, marine, lacus- 

 trine, fiuviatile, and volcanic, containing marine exuviae, 

 shells of the lake, river, and land ; plants and remains of 

 mammalia of extinct and existing species. 



SECONDAEY STEATA. 



III. THE CEETACEOTJS GTEOTJP. A marine series of de- 

 posits, including strata of limestone, sandstone, marl, and 

 clay, abounding in marine organic remains, as plants, corals, 

 echinodermata, mollusca, Crustacea, and fish, with turtles 

 and reptiles. 



IV. THE WEALDEN GrEOUP. An intercalation of fluviatile 

 strata, between the lower greensand and the oolites, being the 

 delta of an ancient river, and comprising beds of sandstones, 

 limestones, and clays; containing land-plants, fresh-water 

 mollusca, and fish ; tortoises, turtles, crocodiles, and enor- 

 mous reptiles, the iguanodon, hylseosaurus, cetiosaurus, 

 and megalosaurus. 



Y. THE OOLITIC G-EOUP. A series of marine strata, of 

 enormous extent; comprising limestones, sandstones, and 

 clays, replete with corals, shells, fish, and reptiles, terres- 

 trial plants, and species of mammalia. 



VI. THE LIAS. A group of marine argillaceous lime- 

 stones, marls, shales, and clays, with marine mollusca, crin- 

 oidea, and fishes ; wood and plants, and enormous reptiles, 

 chiefly of the genera ichthyosaurus and plesiosaurus. 



VII. THE NEW BED SANDSTONE GTEOTJP. A marine for- 

 mation, including marls, sandstones, limestones, and conglo- 

 merates frequently of red, and occasionally of variegated 

 hues, containing gypsum and rock-salt, with corals, mollusca, 

 plants, fish, and reptiles. 



VIII. THE CAEBONIFEEOTJS GTEOTTP. Consisting of shales, 

 clays, ironstone, sandstone,, millstone-grit, and limestone, 

 interstratified with seams of coal, containing fresh water, and 

 marine mollusca and fish, and innumerable remains of ter- 

 restrial and aquatic plants of tropical types, but of extinct 



12 



