^3 SINGULAR ARRANGEMENT OF STRATA. 



that, from these depositions in the angles of the arches we 

 must infer, that the arches were in being before these dej>o- 

 sitions were formed, 

 Anrtherpartof 1*''^- 3 represents another face or precipice of the same 

 the inouatuiii. mountain contiguous to that represented in fig. 2 ; so that 

 Natural arch, it forms one contiguous mass, but with an obtuse saliant 

 angle at a b. In this part too there is an arch I, of larger 

 dimensions than either of the others, and much flatter. It 

 seems to fornn a support for the upper strata, L, L, L, which 

 rest on its extrados. 

 Contorted 1''>e singular contortion, of the strata K, K, is represented 



straia. exactly as it is in nature. 



Strata inter- The strata L, L, L, M, M, M, and N, N, cross and mu- 



sictiiig. tually intersect each other, without losing any of their regu- 



larity in this part. Though I observed them from a distance, 

 their general and reciprocal arrangement is too conspicuous, 

 for me and my fellow travellers to have been deceived. 

 Similar ap- Ii^ tl'us observing the two sides of the mountain analogous 



peurances in dispositions of the strata are observable. I give here the 



other parts of ... , ,, p ,, •, , . n . 



the mountains} ™ost stnking, but all ol them merit the attention of the 

 geologist. 



and elsewhere. The mountains of Jura however are not the only ones, in 

 which I have noticed phenomena analogous to those I have 

 described. I have had opportunities of observing such in 

 the cah-areoiis mountains of the Lyonnese, in that which 

 overlooks the village of Chessy, seven miles north of Lyons, 

 toward the west, in a quarry on its summit, and of which I 

 lately sent an account and drawing to the council of mines. 

 Sec the ])receding article, and PI. II, fig, 1. 



In coal and other mines we every where find examples of 

 great disturbances happening to the surface of our globe, 

 disturbances that must have occured at periods very remote 

 from each other, and that excite our astonishment. Ages to 

 man are but moments to nature. 



xr. 



I 



