368  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1906,  PART    T. 
The  beds  are  massive,  lie  nearly  horizontal,  and  are  covered  by  a  few 
inches  to  nearly  10  feet  of  drift  clay  containing  bowlders  and  gravel] 
This  sand  is  rather  soft,  of  medium-sized,  angular  grains,  and  the  mass 
ranges  from  white  to  light  brown  in  color.  Close  inspection  shows 
that  certain  beds  are  speckled  with  iron-oxide  spots  the  size  of  a  pin 
head,  so  closely  spaced  that  30  or  more  spots  appear  in  a  square  inch 
of  surface.  The  sand  is  slightly  micaceous  and  the  bed  contains  occa- 
sional clay  streaks.  When  crushed  and  dried  the  average  sand  lias  a 
light  yellowish-brown  color,  due  to  impurities,  a  large  proportion  of 
which  might  be  removed  if  the  product  were  washed.  The  process 
of  treatment  is  simple.  After  the  customary  drilling  and  shooting 
down,  the  broken  rock  and  loose  sand  is  loaded  into  the  mill  by  a  steel! 
bucket  on  a  cable  conveyer  and  dumped  directly  into  a  Blake  jaw 
crusher.  The  material  then  passes  through  one  set  each  of  corral 
gated  rolls  and  smooth  rolls  and  is  thus  separated  into  its  individual 
grains.  A  belt  conveyer,  elevator,  and  chute,  in  the  order  given] 
carry  the  sand  to  a  rotary  drier  burning  coke.  From  the  drier  the' 
sand  may  be  delivered  direcl  lv  to  cars  or-  stored  in  bins.  The  capacity! 
of  this  mill  is  about  250  tons  a  day.  The  quarry  is  fairly  well  situated 
with  respect  to  transportation  facilities,  having  direct  connections 
with  the  Chicago  and  Eastern  Illinois  Railroad,  and  switching  conned 
tions  at  Rosedale  with  the  Vandalia  line.  The  market  for  this  sand 
consists  chiefly  of  glass  works  in  the  State  that  make  beer  bottles. 
Some  of  these  works  are  at  Terre  Haute.  Without  washing  the  sand 
is  not  satisfactory  for  hint  and  window  glass.  It  is,  however,  in  great 
demand  for  furnace  use.      [ts  analysis  is  shown  on  page  376. 
Loogootee.  The  Loogootee  Glass  Sand  Company  operates  a  quarry 
in  Martin  County,  1  '  miles  easl  of  Loogootee,  on  the  Baltimore  and 
( )hio  Southwestern  Kailtoad.  The  Mansfield  sandstone  occurs  in  this 
vicinity  in  its  typical  development,  forming  the  bluff  of  Boggs  Creek, 
about  50  feel  high,  and  it  is  reported  to  he  nearly  100  feet  thick,  as 
determined  by  drill.  A  face  of  25  feet  above  t  he  railroad  level  is  open 
in  the  quarry,  disclosing  masses  of  cross-bedded  white  to  brown, 
rather  coarse,  soft  sandstone  containing  a  thin  bed  of  fine  quartz 
pebbles.  Thin  lenses  of  dark  iron-cemented  sandstone  are  common 
and  in  places  iron  oxide  has  been  segregated  to  such  an  extent  as  to 
form  lenses  1  loot  thick.  Streaks  of  carbonaceous  matter  further 
increase  the  percentage  of  impurity  in  the  deposit,  while  joint  planes 
enlarged  to  a  width  of  0  inches  are  filled  with  clay  from  the  surface. 
All  these  objectionable  substances,  constituting  about  5  per  cent  of 
the  quarried  material,  are  separated  by  hand. 
The  equipment  of  this  plan!  is  at  present  inadequate,  but  the  addi- 
tion of  more  complete  washers,  together-  with  driers,  is  contemplated* 
From  the  quarry  the  material  is  wheeled  in  barrows  into  a  small  mill 
consisting  of  one  set  of  rolls,  a  rotary  screen  having  10  meshes  to  the 
