372  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.         [bull.  260. 
Section  of  Pratt  seam  at  Virginia  mine. 
Sandstone :      *  Inches. 
Coal 11 
Slate 2 
Coal 2 
Slate 3 
Coal 7 
Slate 8 
Coal 12 
Total 45 
Section  of  Pratt  seam,  one  and  one-half  miles  west  of  Adger. 
Inches. 
Coal 8 
Clay 12 
Coal 24 
Clay 20 
Coal 18 
Total 82 
The  Nickel  Plate  seam  is  well  known  and  mined  only  at  Virginia 
mines  and  vicinity,  where  the  following  sections  were  obtained : 
Section  of  Nickel  Plate  seam  in  diamond-drill  hole  on  Black  Branch. 
Black  shale:  Inches. 
Coal _•_ 9 
Slate   3 
Coal  24 
Slate 12 
Coal 22 
Slate    33 
Coal    10 
Total   113 
Section  of  Nickel  Plate  seam  in  diamond-drill  hole  at  Virginia  mines. 
Shale :  Inches. 
Coal   33 
Slate    Si 
Coal 21$ 
Total 57| 
Section  of  Nickel  Plate  seam  at  Virginia  mine. 
Inches. 
Coal 32 
Shale 6 
Coal    21 
Total    59 
