252 AUfNALS NEW YORK ACADEMY OF SCIENCES 



The Campagnac system of Bergeron. — The deposits of the Campagnac 

 system in tlie southeastern part of the basin are clearly a continuation of 

 those seen within the Auzits, for study of the included fragments leaves 

 no room for doubting that they came from the south. The outcrops of 

 the coals give evidence of the relationship, which is not masked by the 

 Bagnaud fault, as the section seems to be continuous along the eastern 

 side to Firmy, where one reaches the Bourran system. 



Folding and subsequent erosion have removed much of the Campagnac 

 coal bed from the southeastern corner, how much, of course, cannot be 

 determined. But the series from the upper part of the Auzits into the 

 Campagnac is distinctly conformable, and the dips in the Eulhe bed, as 

 well as in its branch, Eichardie, would carry the coal only a short dis- 

 tance above the hills on the soutlisrly side of Eiou Vieux. The condi- 

 tions justify the suggestion that the Campagnac coal bed at one time cov- 

 ered much of the Auzits area. The Campagnac deposits were made in 

 this southern area by the three streams already mentioned, and the char- 

 acter of the material shows that each was torrential and short, not more 

 than three or at most four miles long. 



The outcrop of the Campagnac coal bed extends practically to the 

 southern edge of the basin. Xear the hamlet of Eulhe, the bed is said to 

 be irregular, tending to lens-form, and it is triple, the main bed being on 

 top. Half a mile farther north, near where the outcrop is crossed by 

 Eiou Vieux, the intervals between the divisions increase and the lower 

 benches show an east and west outcrop as they cross the fold. Centrally 

 along this, they have a northward dip, showing that the fold retains its 

 pitch in that direction. The Bagnaud fault interrupts the continuity at 

 the north end of this area, but the condition was the same throughout, for 

 near Cransac the outcrop of the main bed curves toward the east, to be 

 cut off by the fault. 



On Eiou Vieux, the Campagnac bed is reached Just beyond the place 

 where the railroad from Auzits to Viviez leaves that stream. The mine 

 has been abandoned, and no examination of the coal could be made, but it 

 is apparently on a lower division of the bed, probal)ly the Couche de 

 Eichardie. The overlying rocks are shale and sandstone with, at some- 

 what more than 30 feet above the entry, a sandstone containing much 

 conglomerate. At about one third of a mile farther, one comes to the 

 shaft of Sainte Genevieve on the main bed. No work was in process 

 when the locality Avas visited, but the mine is extensive, the coal having 

 been removed from a rudely triangular space almost 1100 by 1700 feet. 

 The coal is said to be 45 feet thick. An exposure at about 75 feet above 

 the coal and continuing for nearly 200 feet showed shales underlying the 

 conglomerate and the dip is almost southwest at 18 to 20 degrees. 



