8 M. Beaunieb on the Coal District of St. Etienne. 



that have affected them. He meotions well characterised si- 

 liceous fossil-wood.* 



It is to be regretted that the youth of the author, and the 

 state of science when he wrote, should have given rise to se- 

 veral mistakes, which it is not our present object to rectify. 



The levels of the different rocks passed in review, can be 

 ascertained from the atlas of the Loire mines. 



1. The primitive country can be traced without interrup- 

 tion from the Rhone near Givors (at a height of 169 metres" 

 [563 feet] as far as the principal heights of the Pilat, ele- 

 vated 1,200 metres [3,937 feet] also above the level of the 

 sea.t 



The pit of Logis des Peres near Rive de Gier, gives the 

 deepest section of these coal measures, its depth is 23 metres 

 [82 feet] beneath the level of the sea ; % on the other hand 

 their greatest elevation is (at Mont Salson, near St. Etienne) 

 725 metres [2,379 feet] above the same level. It follows that 

 the greatest observed depth of the coal measures is 750 metres, 

 [2,46 1 feet.] 



3. The greatest observed elevation of the formation at St. 

 Priest and La Tour is 600 or 650 metres, [1,968 to 2,134 

 feet]. 



* Essai sur la Lithologie des environs de St. Etienne, p. 45. 



+ The height of the Pilat has been estimated at 1,215 metres [3,986 

 feet] in the Annuaire statistique du department de la Loire, printed by- 

 order of M. de Colombier. We do not know what observations led to 

 this result. 



t The depth of the coal measures 8 metres [261 feet] below the level of 

 the sea, is shewn by the pit of Matouret, 325 metres [984 feet] in depth, 

 the mouth of which is higher than that of Logis des Peres. 



