4216  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1905. 
whether  the  top  seam  of  the  Mary  Lee  group  is  Newcastle  or  Mary  Lee.     It  is  treated 
here  as  Mary  Lee.     The  seam  is  not  well  known  along  its  outcrop  southwest  of  Say  ret  on. 
The  Mary  Lee  is  a  thick  but  very  dirty  seam.     The  coal  requires  washing  before  it  is 
made  into  coke.     The  following  average  sections  from  various  points  exhibit  its  general 
character: 
Average  section  of  Mary  L<<  seam  at  Littleton  and  Sayre. 
Inches. 
Coal 12J 
Parting { 
Coal 7i 
Clay (1s 
Coal 174 
Parting £ 
Coal m 
Clay -  -     18 1 
Coal  (one  or  more  thin  partings) :u 
106* 
The  two  thick  clay  partings  are  persistent  features  of  the  scam  in  this  locality.  They 
divide  the  coal  into  three  thick  benches,  which  are  more  or  less  broken  by  thin  sporadic 
partings. 
West  of  Morris,  in  the  vicinity  of  Crooked  Creek,  the  tripartite  character  of  the  seam  is 
not  quite  so  conspicuous,  although  it  still  persists,  as  shown  in  the  section  below: 
Averagt  section  of  Mary  L<<  seam  mar  Morris  and  Crooked  Creek. 
Inches. 
Coal P 
Parting J- 
( Joal 1 1 
Parting li 
<  Joa  1 51 
Parting 0-lj 
Coal I 
Parting 6§ 
Coal HI 
Parting  (usually  absent) 0  1 1 ' 
Coal 21 
451 
The  partings  of  1 }  and  6j  inches  shown  in  this  section  appeared  in  every  section  from 
which  the  average  was  obtained,  and  are  constant  features  in  the  locality.  They  are  prod 
ably  the  same  as  the  two  thick  partings  farther  west.  Northeast  of  Morris  are  a  few  out- 
liers of  this  seam.  To  the  east,  at  Fedora,  along  Flat  Creek,  and  thence  southwest  ward, 
it  shows  at  a  number  of  points.  The  coal  is  very  dirty  and  generally  thinner  than  it  is 
farther  south.  It  is  always  overlain  by  shale  and  underlain  by  sandstone.  It  is  probal 
bly  of  less  value  along  this  part  of  its  outcrop  than  elsewhere  in  the  quadrangle.  At 
Lewisburg  and  Sayreton  it  is  a  thick  but  dirty  seam,  as  shown  in  the  following  section: 
Average  section  of  Mary  Lee  coal  seam  at  Lewisburg  and  Sayreton. 
Inches. 
Coal 8 
Parting U 
Coal 4\ 
Parting $ 
Coal P 
I  'art  ing 1  \ 
Coal 3 
Parting 3% 
Coa  1 12 
Parting 8| 
Coal 28| 
~76* 
