1818.] ON THE FORMATION OF ROCKS. 293 



tunian origin. It is found aggregated at the foot of moun- 

 tains^ and occupying vallies^ both in the mountains 

 and level countries. It likewise constitutes ranges of 

 mountains of considerable height and extent^ as from 

 the lake of Wallastein to near Berne in Switzerland, 

 which includes the Rigaberg, a mountain of nearly 

 4000 feet above the level of the sea. Montserrat, in 

 Spain, is part of a broken mountainous formation of 

 puddingstone, nearly 30 leagues in extent. 



In these puddingstones have been found rounded 

 masses of puddingstone of a prior formation ; and in 

 those rounded masses, pebbles of puddingstone of a still 

 more ancient date, 



19. Mock- Salt resembling that we find formed 

 by evaporation on the surface of the earth, and at the 

 bottom of lakes and ponds, alternates with clay sand- 

 stone and gypsum. This compells us to include it in 

 the rocks of Neptunian origin, though the nature of the 

 substance itself does not exclusively prove such an 

 origin. 



It is found in bregular masses, and disseminated 

 in argil and sandstone, on the edge of the secondary 

 rocks at Cracow, and along the foot of the Carpathian 

 mountains in Poland ; likewise at Hal and Saltzburgh 

 at the foot of the Tyrolian mountains. At Cordona m 

 Spain, and many other places, it is included in the red 

 sandstone formation. 



The principal depots of salt in England, are on a 

 line mnning nearly south from Northwich to Droit- 

 wich, parallel to, and not far distant from, the tran^^i* 

 tion rocks in Wales. 



Vol. I. X 



