364  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.         [bull.  260. 
ured  in  the  before-mentioned  diamond-drill  hole  on  Black  Branch  is 
574  feet.     The  average  interval  is  probably  about  000  feet. 
Below  the  Mary  Lee  coal  is  about  50  feet  of  shale  and  sandstone, 
at  the  bottom  of  which  lies  the  Blue  Creek  or  Big  coal.  This  is  suc- 
ceeded by  about  40  feet  of  shale,  just  below  which  lies  the  Jagger 
coal.  These  measurements  were  made  along  the  Louisville  and  Nash- 
ville Railroad  between  Johns  and  Adger.  Mr.  McCalley  describes 
the  Ream  coal  seam  as  occurring  locally  below  the  Jagger  seam.  He 
gives  no  measurement  of  the  interval  in  this  quadrangle,  however, 
nor  did  the  writer  secure  one,  but,  judging  from  McCalley's  map  of 
the  Warrior  basin,  it  is  about  50  feel. 
A  coal  that  is  assumed  to  be  the  Jefferson  coal  is  exposed  along  the 
little  stream  entering  Blue  Creek,  about  three-fourths  of  a  mile  south- 
west of  Adger,  and  according  to  computed  measurements  it  is  about 
o00  feet  below  the  Jagger  seam,  the  two  coals  being  separated  by  shale, 
with  sandstone  beds  of  greater  or  less  thickness  in  the  upper  part. 
Some  of  these  sandstone  strata  are  conspicuous  at  Johns,  where  they 
make  a  prominent  ridge.  The  Black  Creek  coal,  as  distinct  from  the 
Jefferson,  was  not  seen  by  the  writer,  but  is  included  in  the  section  on 
the  authority  of  Mr.  McCalley,  who  maps  and  describes  it  without 
stating  its  distance  below  the  Jefferson  seam  in  this  quadrangle.  His 
map  indicates  that  the  distance  may  be  50  feet. 
Below  the  Jefferson  Creek  coal  is  190  feet  of  shale,  at  the  base  of 
which  is  a  coal  seam.  This  seam  outcrops  at  a  number  of  points 
along  the  road  from  Belle  Sumpter  to  Adger,  and  on  the  roadside 
near  the  little  stream  west  of  Adger  it  is  25  inches  thick.  The  coal 
seam  just  described  is  succeeded  below  by  100  feet,  apparently  of 
shale,  which  includes  two  or  more  thin  coal  seams.  These  coals  may 
be  seen  in  the  road  west  from  Adger  to  Razburg,  just  to  the  west  of 
the  point  at  which  it  crosses  the  little  stream  above  mentioned. 
The  shale  described  above  rests  on  a  stratum  of  rather  thick- 
bedded  sandstone,  which  is  about  100  feet  thick  and  is  well  exposed 
at  the  point  just  mentioned,  where  the  road  crosses  the  stream.  The 
sandstone  makes  conspicuous  ridges  west  of  Adger,  but  it  is  not 
known  whether  it  is  a  persistent  stratum.  Below  this  sandstone  is 
about  300  feet  of  dark  clay  shale,  which  is  well  exposed  along  the 
road  about  three-fourths  mile  west  of  Adger.  At  the  base  of  this 
shale  is  a  sandstone  which  is  exposed  on  the  little  stream  above  men- 
tioned about  midway  between  its  mouth  and  its  intersection  with  the 
road  between  Adger  and  Mud  Creek.  The  sandstone  is  the  lowest 
stratum  exposed  in  this  part  of  the  field. 
This  carries  the  section  down  650  feet  below  the  Black  Creek  coal. 
The  interval  between  the  Black  Creek  coal  and  the  before-mentioned 
sandstone  at  the  base  of  the  general  section,  measured  along  the  road 
