1821.] Mr. Weaver on Floetz Formations. 



Third Series, comprehending the Formations of 



253 



Group, 



In England. 



1. Shell limestone. 



a. Lias limestone. 

 No. 15ofG. M. 



b. Oolite. Groups, No. 14 

 up to No. 9 inclusive, of G. M. 



2. Ferruginous and green 

 sandstone and limestone. 

 Groups, No. 8 to No. 6 inclu- 

 sive of G.M. 



Group, No. 5 of 



In Germany. 



1. Upper, or shell limestone 

 formation of M. Freiesleben. 

 Muschelkalkstein of Werner. 



2. Quader and Planer sand- 

 stone and limestone of Werndr, 



Hausmann, von Schlotheim, 

 von Raumer, &c. 



The third foetz sandstone 

 formation of Werner. 



3. Kreide o ditto. 



3. Chalk 

 G. M. 



Fourth Series, comprehending the Formations of 



In England. On the Continent 



1. Plastic clay. Group,' 

 No. 4 of G.M. 



2. London clay. Group, 



No. 3 of G.M. 



3. Freshwater limestone. 

 Group, No. 2 of G. M. 



4. Upper marine. Group, 

 No. 1 of G. M. 



5. Wood coal. ! 



6. Newest floetz trap, por- 

 phyry, and syenite, of Werner. 



In the north of Ireland, the 

 Western Isles, and mainland 

 of Scotland, overlying both 

 primary and transition tracts, 

 as well as the floetz of the first, 

 second, and third series. Per- 

 haps, also, in part, in the north 

 of England. 



> 



In the Paris basin, and other 

 parts of France, Netherlands, 

 Switzerland, Germany, Italy 

 &c. 



In Bohemia, Saxony, Silesia, 

 Auvergne, Italy, &c. 



In the same position, and, 

 ►also, overlying and alternating 

 with floetz formations of the 

 fourth series, e. g. in Au- 

 vergne, and the north of Italy.* 



To complete our view of the existing state of the crust of the 

 globe, we must also notice 



III. Pyrogeneous Formations. 



Mineral masses affected by the operation of subterraneous 

 fire ; 



a. The pseudo-volcanic ; e. g. collieries in a state of combus- 

 tion. England and Germany. 



* See, for instance, Dr. Daubeny in the Edinb. Philos. Journal, vols. iii. and iv. ; and 

 Ebel'b Alpen-Bau, vol. i. 



