TABULAR ARRANGEMENT OF SECONDARY STRATA. 



159 



SECONDARY FORMATIONS, 



above the transition and regular coal formations, and terminating 

 with chalk. 



1. Red Sandstone and Marl with Magnesian Limestone. 



a Lower beds of new red sand- a Gres rouge ancien et roihe- 



todte-liegende. 

 b Zechstein et rauchwacke. 

 c Gres bigarre ct gres des V^os- 

 ges, muschel-halk. 



stone. 



b Magnesian limestone. 

 c Upper red sandstone. 



(Muschel-kalk wanting in Eng- 

 land.) 



d Red marl with fibrous gypsum. 



2. Lias Limestone and Lias Clay. 

 a White lias and micaceous sand- ^ 



Calcaires d gryphites 



d Keuper^ marnes irrisees. 



stone. 



b Blue lias with marlstone. 

 c Lias clay and shale. 



3. Oolite Limestone and Beds of Clay and Sandstone. 



a Inferior and Bath oolites with^ 



sandstone, Oxford or clunch 



clay. 

 b Middle oolites, 

 c Bituminous or Kimmeridge 



clay. 



d Upper or Portland oolite. 



4. Wealden or Sussex Beds. 

 a Weald clay with sandstone. ^ This may be regarded as a local 

 b Sandstone, calcareous grit. ! formation of limited extent, 

 c Petworth and Purbeck lime- ( but extremely interesting on 

 stone. J account of its fossil remains. 



5. Green Sand and Chalk. 



a Lower green sand and iron 

 sand. 



b Blue clay, called Gait, 

 c Upper green sand. 

 d Chalk marl. 

 e Chalk wiihout flints. 

 / Upper or flinty chalk. 



Calcaires oolitiques, and some- 

 times calcaires de Jura, and 

 also calcaire Alpin. 



Gres vert et gres f err ugineux, 



Craie tufenu. 

 Craie inferieure, et 

 Craie superieure. 



introduce numerous subdivisions of strata, and to identify them with those in other 

 situations, will be ready to acknowledge that such labours are too microfogical, 

 and that by endeavouring to mark divisions, where Nature has not established 

 them, we lose our time, and introduce needless perplexity into the science. A 

 reference to the two sections of the oolite formation, given at the end of the next 

 chapter, will serve to evince the truth of the above remarks. 



