268  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   1903.        .  [bull. 225. 
Section  of  Neal  coal  above  Hurst, 
Roof  shale.                                                                                                      Ft.  In. 
Coal 5  5 
Clav 1  -0 
Coal 0  8 
Total 7       1 
Section  of  Neal  coal  in  Gray  Knob. 
Roof  shale.  Ft.  In. 
Coal 0  4 
Clay 0  1 
Coal 4  3 
Coal 0  0 
Clay - 0  5| 
Coal 0  4 
Clay  0  1 
Coal 4  4 
Total 9     10£ 
The  6  to  12  inch  clay  seam  in  many  of  the  sections  has  a  character- 
istic white  color.  In  its  greatest  thickness,  as  reported  by  McCreath 
and  d'Invilliers,05  it  shows  as  follows: 
Section  of  Neal  coal  on  Gray  Knob. 
Shale  roof.  Ft.  In. 
Coal 0  5J 
Knife-edge  parting 0  0 
Coal. 3  3 
Fire  clay 0  8 
Coal 0  1 
Shale 0  1 
Coal : 0  5 
Shale '. 0       | 
Coal 0  7f 
Shale 2  4 
Coal 5  7 
Total 13    6J 
The  Neal  coal  also  reaches  a  thickness  of  11  feet  at  the  head  of 
Puckett  Creek,  though  badly  split  up. 
Interval  between  Neal  and  Harlan  coals. — Between  the  Neal  coal  and 
the  Harlan  coal  is  an  interval  of  from  900  to  1,000  feet,  in  which  work- 
able coal  has  been  found  at  a  number  of  horizons,  though  at  none  of 
these  could  enough  data  be  obtained  to  prove  that  workable  coal 
occurs   at  those  horizons    over   any  considerable    part   of  the  field. 
"  McCreath,  Andrew  S.,and  d'Invilliers,  E.  V.,  Resources  of  the  upper  Cumberland  Valley,  Louis- 
ville, Ky.,  1888,  p.  79. 
