236 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   L905. 
seam  is  locally  known  as  one  of  the  most  perfect  in  the  field,  as  to  quality  of  coal,  charac- 
ter of  the  scam,  and  its  ability  to  withstand  weathering.  A  sample  for  analysis  was  taken 
at  the  breast  of  an  old  working  I  K)  about  250  feet  in  and  a  second  sample  of  the  same  seam 
i:i  a  recently  opened  drift  (()).  Both  of  these  represent  the  whole  face  of  (he  seam — 8  feet 
;;  i  ic'ies  of  coal. 
Analysis  of  coal  from  Wadge  s<<iin,<>n  }'<nnpa  River. 
[  I'".  M.  Stanton,  analyst.] 
Sample  EC. 
Sample  0. 
9.49 
37.89 
47.  04 
5.  58 
10.59 
'Ml  75 
47.53 
Vsh               
5. 13 
Sulphur 
100.00 
.41 
2.40 
too.  00 
.44 
4.00 
A.bout  '»<»  feet  stratigraphicallj  belov  the  Wadge  seam  is  a  thick  seam  of  coal  opened 
by  an  entry  driven  under  the  stage  road  on  the  north  side  of  the  river.  This  seam  meas- 
ures |(l  feet  3  inches,  and  possibly  a  111  I  le  mure,  of  which  the  lower  7  feet  of  coal  have  been 
rained  out.     This  was  separated  from  the  upper  8  feet  of  cod  by  L  5  inches  of  sandy  parting. 
( )n  a  side  gulch  entering  Wolf  Creek  from  the  cast,  2  miles  above  the  river,  a  seam  of  the 
lower  group  has  been  opened,  exposing  coal  at  least  (i  feet  1  inches  thick,  with  two  or  three 
thin  partings.  The  partings,  however,  arc  not  constant.  .lust  over  the  divide  to  the  east, 
on  Butcherknife  Creek,  are  several  openings  on  coals  of  this  same  group.  An  enl  ry  recently 
made  on  Mr.  ( lai  t  man's  property  (L)  exposed  coal  measuring  as  follows: 
Section  of  coal  on  Gartman  property. 
Ft.   In. 
Coal 5    6 
Bone.... 4 
Coal (i 
(i     i 
A  sample  representing  all  but  the  I  inches  of  bone  showed  t  he  following  analysis: 
[nalysis  of  coal  (Samph  IS)  from  Gartman  entry,  on  Butcherknife  Creek. 
|  !•'.  M.  Stanton,  analyst.] 
Moisture .10.92 
Volatile  matter 36.  .r>3 
Fixed  carbon 46.73 
Asli 5.82 
KM).  00 
Sulphur 60 
Loss  of  moisture  on  air  drying 3.40 
Anthracite  field. — Intrusive  igneous  rocks  of  several  types  cut  the  coal-bearing  beds  at 
many  points.  Within  the  coal  held  the  district  in  which  this  activity  was  greatest  cen- 
ters about  Pilot  Knob  and  Wolf  Mount  aim  By  far  the  most  common  of  these  intrusive 
rocks  is  the  basall  that  composes  Pilot  Knob,  Wolf  Mountain,  Booker  Mountain,  and 
many  lesser  peaks  and  ridges  of  this  vicinity.  The  whole  district  is  known  as  the  Anthra- 
cite  Range.  The  ro  k  it-elf  is  a  typical  olivine-basalt.  The  basaltic  peaks  have  the 
appearance  of  huge  dike-,  probably  marking  the  fissures  through  which  this  rock  ascended, 
Smaller  dikes  of  approximately  vertical  position  radiate  from  the  larger  masses,  and  sills 
of  the  same  material  are  found  interbedded  with  the  sediments  in  many  places. 
