GYPSUM    TN    NORTHWESTERN    NEW    MEXICO.  263 
Farther  south,  between  Gallina  and  Senorita,  the  same  gypsum  bed 
was  observed  at  many  places,  but  its  thickness  and  its  relations  to  the 
overlying  and  underlying  rocks  were  not  particularly  noted.  East  of 
Lajara  the  bed,  if  present,  is  completely  covered  by  flat-lying  Tertiary 
sediments,  which  overlap  the  Mesozoic  section  from  the  west.  This 
condition  probably  exists  at  several  localities  between  Gallina  and 
Senorita. 
At  Senorita  the  rocks  that  include  the  gypsum  dip  very  steeply  to 
the  west.  The  gypsum  bed  outcrops  above  a  limestone  bed  50  feet 
in  thickness,  from  which  lime  has  been  burned  for  local  use.  So  far 
as  known,  the  gypsum  has  not  been  utilized  at  Senorita,  where  it  out- 
crops, striking  north-south  about  one-fourth  mile  west  of  the  post- 
office.  The  company  that  has  a  copper  smelter  situated  at  Senorita 
has  opened  a  6-foot  coal  bed  which  outcrops  about  one-half  mile  west 
of  the  gypsum  outcrop.  This  bed  furnishes  a  good  grade  of  bitu- 
minous or  subbituminous  coal  and  its  outcrop  parallels  the  gypsum 
outcrop  throughout  its  extent  as  mapped.  The  presence  of  this 
coal  should  do  much  to  hasten  development  of  the  gypsum  bed  at 
this  point.  As  will  be  seen  from  the  section  that  follows,  the  gypsum 
bed  has  a  thickness  of  54  feet  at  Senorita. 
Section  of  rocks  exposed  at  Senorita. 
Feet. 
Mesaverde  coal  measures,  containing  6-foot  coal  bed 
Mancos  shale 2.  500+ 
Dakota  sandstone  (shale  and  sandstone  at  base  of  unknown  age).  GOO 
Gypsum ;  massive,  white 54 
Limestone,  white,  crystalline 50 
Shale,  red  and  greenish  drab 000 
"Red  Beds"  sandstones  and  shales  (copper  bearing  at  base).. .  750 
About  3  miles  west  of  San  Miguel  copper  mine,  at  present  aban- 
doned, a  bed  of  massive  white  gypsum  60  feet  thick  outcrops,  dipping 
nearly  due  west  at  an  angle  of  40°.  '  Here  the  gypsum  is  overlain  by  a 
bed  of  limestone  40  feet  thick.  The  following  section  shows  the  rela- 
tions of  the  underlying  and  overlying  rocks  to  the  gypsum. 
Section  of  rocks  exposed  at  San  Miguel  mine. 
Feet. 
Dakota  sandstone  and  shale  at  base  (shale  may  be  Jurassic) 100  + 
Crystalline  limestone 40 
Massive  white  gypsum 60 
Light  pinkish  sandstone,  red  shale  at  base 80 
Light  pinkish  sandstone,  copper  bearing 40 
Red  sandstone,  with  some  shale  interbedded  (Jurassic-Triassic). . .  300  + 
Pre-Carboniferous  (pre-Cambrian?)  granite. 
The  gypsum  deposit  at  this  point  is  easily  accessible  by  the  wagon 
road  to  Bernalillo,  and  could  be  mined  over  an  extensive  area,  at  first 
by  open  cut  and  later,  as  necessity  demanded  it,  by  slope  or  incline. 
