the Aluschelkalk, Sfc. • 325 



In the other parts of France, I have only suspicions of its 

 existence in the environs of Vitteaux, Rouvray, and Cussy- 

 les-Forges, &c. Perhaps it also exists to the south of Nevers; 

 the limestone near Aubenas, in the Vivarais, presents some 

 of the characters, which distinguish it from the lias, which 

 occurs more to the west of that town. It appears to be to- 

 tally wanting in the west of France, as in England ; but it 

 occasionally appears united with the new red sandstone at 

 the foot of the Pyrenees; thus in the department of the 

 Landes, at the foot of Porci d'Arzet, in the commune of 

 St. Pandelon, the upper part of the new red sandstone marls, 

 with gypsum and saline springs, contains two beds of mus- 

 ch«lkalk partly of a peculiar oolitic structure, and it is also 

 seen above the same maris, on the foot of the mountains of 

 the Conserans. 



On the other hand, it is possible that this limestone even 

 occurs in the Alps, particularly in those of Salzburg, for 

 some limestones are known there, which are whitish or grey, 

 granular or compact, with terebratulae and pectens, and 

 which from their position may one day be recognised as 

 rauschelkalk. On the southern side of the Alps, the Abbe 

 Maraschini suspects its existence beneath the oolite formation 

 of the Veronals ; and in Hungary, some magnesian lime- 

 stones, like those of the environs of Bude, may, from their 

 position and nature, be sooner or later referred to it. 



Third Secondary Sandstone or Quadersandstein. 



The second secondary limestone is in Germany covered 

 by an arenaceous deposite, named quadersandstein by the 

 Germans. This deposite is as little known to foreign Geolo- 

 , gists as that of the muschelkalk, they have not yet learned 

 to assign it its proper place among the secondary formations, 

 and they have either not recognised it in their own coun? 

 tries, or have compared it to deposites altogether different, 

 -as for example, the sandstone of Fontainebleau. 



The obscurity that still envelopes this formation depends 



