1821.] Mr. Weaver on Floetz Formations. 251 



I. Primary Formations.* 



II. Secondary Formations. 



A. Transition.* 



B. Floetz : which, as characterized by particular minerals, or 

 by predominant constituent masses, may be designated as 



First Series. 



1. Old red sandstone. "j 



2. Carboniferous limestone. > The great carboniferous tract. 



3. Coal formation. J 



Second Series. 



1. Calcareous conglomerate. "") rp, , „ „,„ m „„j „„i:r„ 

 n -.„ ,. & , i Ihe great gypsum and sanie- 



2. Magnesiau limestone. > 



3. New red sandstone. 



J 



Third Series. 

 1. Shell limestone (lias and"") 



°°j! te J; The great shell limestone 



- I. rerrugmous and green > ° tract 



sandstone and limestone. 

 3. Chalk. 



Fourth Series. 

 All formations of an era later "^ rp, ^ , . • DOrD ] lvrv 



than chalk, including the newest > ° tract 



floetz trap formation of Werner. J 



A more detailed exposition of the floetz series in the British 

 Isles, compared with their equivalents on the Continent, is the 

 following : 



First Series 



Has been already detailed. 



Second Series, as comprehending the Formations of 



In England. In Germany. 



1. Calcareous conglomerate 1. Conglomerate and marly 



and sandstone. sandstone, the weissliegende of 



Included in group No. 17 of M. Freiesleben. 

 G. M. being the lowest bed. This is considered by that 



author as the lowest bed of the 

 following formation. 



• I omit all detail of the primary and transition formations, as a fuller consideration 

 •f than docs not enter into my present view. 



