Rock Salt at Car dona, in Spain. 61 



5. These saliferous gypsum rocks possess marked analo- 

 gies with the system of Cardona. 



6. From the preceding data, this system ought itself to 

 be considered as forming part of the transition series. 



7. Hence it follows, in the last place, that another forma- 

 tion of rock salt and gypsum, must be admitted in geological 

 arrangements.* 



of the mountain of Cardona as constituting part of the saliferous, or new- 

 red sandstone formation, which surrounds it. It is possible that the ver- 

 tical position of the salt beds may be occasioned by some contortion in 

 that formation, as the beds on either side rise towards the ridge of the 

 mountain. The only fact against this hypothesis is the non-conformable 

 position of the salt beds and new red sandstone at those places in the 

 valley where they may be observed in contact. (Trans.) 



* An account of the salt mines at Cardona has been given by Dr. 

 Traill, in the 3d volume of the Geological Transactions, p. 404 to 412, 

 (Trans.) 



