221 



ILLUSTRATIONS OF THE 



bauliure, in defcribing the rout from Geneva 

 to Chamouny, mentions many remarkable in. 

 ftances of the bending of the flrata, and parti- 

 cularly where the fmall ftream of Nant d'Ar- 

 penaz forms a cafcade, by falling over the face 

 of a perpendicular limeftone rock. The ftrata 

 of this rock are bent into circular arches, ex- 

 tremely regular, and with their concavity turned 

 to the left. What deferves partic ularly to be 

 remarked, is, that a mountain behind the caf- 

 cade has its ftrata bent in a direction oppofite to 

 the former, or with their concavity to the right. 

 There is no doubt that the flrata of both rocks 

 are the fame, fo that a vertical feclion of them 

 would give a curve, in the figure of an S*. 

 Thefe circumflances are mentioned by Sauflure, 

 and from them we may infer this other proper- 

 ty of thefe ftrata, that their fedion by a hori- 

 zontal plane, muft exhibit a fyftem of ftraight 

 lines, probably all parallel to one another. 



The fame mineralogift defcribes the calcareous 

 ftrata which corapofe the mountain Axenberg, on 

 the fide of the Lake of Lucerne, as having from 

 top to bottom of the mountain the form of the 

 letter S compreffed (ecrafce)^ with their curva- 

 ture in fome places very great. Thefe inflex- 



' ions 



-• 



* Voyages aux Alpes, voL i. § 472 ; alfo^ Theory 

 of the Earth, vol. ii. p, 30. 



^ 



