POCKET    COAL   DISTRICT,   VIRGINIA.  415 
Section  of  coal  bed  9  at  Wax  opening,  at  the  head  of  Bah  y   Trace. 
Shale,  sandy.  Ft.  in. 
Coal 3      6 
Shale,  carbonaceous \\ 
Coal ]       i 
Coal,  impure 4 
Total  coal i     n 
Bed  10. — About  40  feet  above  bed  (.)  occurs  bed  10,  which  is  one  of 
the  thickest  coal  beds  in  the  district.  It  has  an  average  thickness  of 
6  feet,  and  contains  a  clay  parting  in  the  upper  part,  also  a  thin  coaly 
shale  layer  about  2  feet  above  the  base.  The  bed  is  usually  overlain 
by  sandstone  and  underlain  by  shale.  It  outcrops  high  in  the  slopes 
of  Little  Black  Mountain,  and  covers  but  a  small  area  within  the 
district.  Three  sections  of  bed  10  were  measured,  two  at  the  head 
of  Baley  Trace  and  one  on  the  left  fork  of  Gin  Creek.  The  following 
sections  are  representative  of  the  bed: 
Section  of  coal  bed  10  at  the  head  of  Baley  Trace. 
It.   in. 
Sandstone,  gray 8 
Coal 1       7 
Shale,  coaly ". .        1^ 
Coal 3$ 
Clay,  light  gray 8 
Coal ' 2       6 
Shale,  coaly \\ 
Coal 1.  2       G 
Total  coal 6    -10$ 
Section  of  coal  bed  10  at  the  brad  of  Gin  Creek. 
Ft.  in. 
Coal 1 
Clay 4 
Coal 2      8 
Shale  ci  inly _ 1 
(  \  ial 2        1 
Total  coal 5      9 
Bed  11.  About  300  feet  above  bed  10  occurs  bed  11.  This  coal 
bed  was  not  examined,  but  it  is  reported, to  be  3  feet  thick.  It  out- 
crops high  on  the  mountain  slope,  being  only  70  feet  below  the  base 
of  the  Harlan  sandstone,  and  underlies  only  the  upper  portion  of 
Little  Black  Mountain 
Bed  12. — This  is  the  highest  workable  bed  known  in  the  district. 
It  occurs  60  feet  above  bed  11,  immediately  beneath  a  massive  gray 
coarse-grained  sandstone  believed  to  be  the  Harlan  sandstone.  The 
bed  has  a  thickness  of  4  to  5  feet  and  consists  of  firm,  massive  coal. 
As  it  is  the  highest  coal  bed  on  the  slopes  of  Little  Black  Mountain, 
it  has  the  smallest  distribution  of  all  the  beds  within  the  district.     It 
