104 On the Formations oj (he Western Swiss Alps, 



of Fiz, on the side of Sixt, at a place called Faucilles dit 

 Chantet. 



This contortion runs across below the mountains of Fiz, 

 and is seen at the celebrated waterfall of the Arpenaz, on 

 the banks of the Arve. Lastly, a fifth locality, where the 

 same observation may be repeated, is found near Gietaz, in 

 the valley of Megeve. 



In all these localities, the contortion of the beds is situated 

 in the Jurassic formations, while the cretaceous formation 

 covers these dislocations without having shared in them. 



6. The nnmniulites limestone, which pai'ticipates in all the 

 dislocations which have given relief to the cretaceous grounds. 

 Besides the characters indicated by M. Leymerie for this for- 

 mation in the Corbieres,* it furnishes us, among the Alps, 

 with the opportunity of making two important observations. 



"VVe observe, in the first place, that this formation contains 

 a bed of coal so considerable as to be wrought at some points. 

 These localities, advancing from NE. to SW., are the chain 

 of Titlis ;t at the extremity of tlie cantons of Bei'ne and Un- 

 terwalden, the heights of Beatenberg and Habkeren,:}: to the 

 north of the Lake of Thun, and the Mittaghorn, to the south 

 of Frutigen ; these localities are indicated by M. Studer. 

 There are others besides, which I have visited myself, namely, 

 — the celebrated bed of Diablarets, where the coal is associ- 

 ated with Cerithium diaboli and other fossils. The mine of 

 Pernant, not far from Arrache, on the right bank of the Arve ; 

 this mine was described by M. Keeker in 1826. § I shall only 

 add to his observations, that the bed of fossils is in contact, and 

 below the true nummulitic limestone, and forms part of that 

 formation. The coal-mine of Petit-Bornantnear Bonnevilles, 

 and that of Entrevergne on the southern shores of the lake 

 of Annecv. 11 These eio;ht localities running* nearlv in a line 



* Memoires de la Societe Geolog. de France : .Archives, 1846, t. i., p. 107. 



t Studer, Mem. de la Soc. Geolog. de France, t. iii., p. 394. This is merely a 

 carburetted schist. 



; Studer, Ihid. iii., 388. Tlie coal has been mined these 40 years. 



§ Necker, Bibl. Univ. de Geneve, Sc. et Arts, xxxiii., 90. 



II Bulletin de la Societe Geolog. de France. Extraordinary meeting at Cham- 

 bery, 1844 ; t. i., p.GOl, &,c. 



