246 



ANNALS NEW YORE ACADEMY OF SCIENCES 



Le^ende 



Couches fA^'^^'icff^" d'Auz/fs 



de < * ff ^ —id— de Campaynac 

 houille 1 -^iJLi - '■' -^ " 



Am_ Amphibolife 



An Andesife 



E Eocene 



G Granite 



Gr Granulite 



Gn ^/;e/'55 



GnGr ...Gneiss granu/i/iaue 



<H //w///fr 



J Jurassigue 



M Micaschisfes 



M g Microgranu'lite 



P m Permian moyen 



R i Permien inrerieur 



S Serpentine 



K?.-A...Rocheporph>jri(fue3lteree 



Moulin 



Oe/M 



deVal^^V. 



MAP OF THE COAL BASIN OF DECAZEVILLE. 



Reproduced with slight reduction from the memoir by Bergeron, Jardel and 



Picandet. 



