156 M.CuAHBAvr on the 



which they rest, and divided into small prisms perfectly re- 

 sembling a pavement. 



This observation had, for some time, shaken my opinion 

 respecting the distinction of the two formations ; but I have 

 since convinced myself, that this parallelism only belongs to 

 the first beds deposited on the gryphite formation, and that 

 soon after the marls no longer present this relationship. 



The most complete proof is obtained of the difference of 

 formation of these two kinds of rocks, by seeing the most 

 ancient beds break through the foot of the talus of shelly 

 marls, between Conliege and Perigny ; also breaking through 

 above the bituminous beds of the knoll of Pimont, with an 

 inclination of 50"" to the east, whilst the latter dip in a con- 

 trary direction ; by seeing them rise nearly to the oolitic 

 beds at Montaigu, to the marls of the second stage at Salins, 

 and much higher still in other places. 



I shall lastly add, that immediately on the N.E. of Lons 

 le Saunier, perfectly horizontal beds of pyritous shelly marls 

 are found, and that at less than a gun-shot to the north of 

 this point, vertical beds of gryphite limestone are seen rising 

 above the ground, without varying sensibjy in situation ; 

 which clearly shews that the pyritous shelly marls, and con- 

 sequently all the oolitic rocks, did not exist at the time of 

 the displacement of the gryphite beds.* 



This is the place to describe the singular positions in which 

 the upset beds are found of the enormous masses of oolitic 

 limestone ; but not to prolong this memoir to too great a 

 length, I shall not undertake to treat on this subject with 

 all the detail of which it is susceptible ; I shall confine my- 

 self to citing the following examples : 



* These appearances may very easily be produced by faults, known 

 not to be uncommon in lias, the coast section I have given in the G'eol. 

 Trans, vol. i, new series, plate 8, shews some that have affected both 

 the lias and new red sandstone beneath it. That considerable faults 

 occur in the neighbourhood of Lons le Saunier, is clearly seen by the 

 author's account of that country, therefore the different beds may easily 

 come in contact with different dips. (Trans.) 



