408 
CONTRIBUTIONS   TO   ECONOMIC    GEOLOGY,  1905. 
Across  the  divide  between  Hot  Springs  Mountain  and  North  Mountain  a  similar  series 
of  clays  is  exposed  near  the  northeast  corner  of  the  reservation.  At  this  point  8  feet  of  gray 
clay  is  shown,  with  no  reddish  bands,  but  containing  considerable  line  sand.  Samples  col- 
lected from  this  locality  and  analyzed  by  George  Steiger  gave  the  following  results: 
Analysis  of  clays  from  North  Mountain. 
Silica 70.  31 
Alumina ' 17.27 
Titanic  oxide 1. 00 
Iron  oxide 1. 85 
Lime 23 
Magnesia 01 
Soda 20 
1  'ot ash 3.  51 
Combined  water 4.  30 
Moisture 88 
On  the  south  slope  of  West  Mountain,  clay  beds  are  exposed  al  several  points.  These 
clays  arc  of  the  same  general  character  as  those  shown  On  Hoi  Springs  Mountain  and  North 
Mountain.  At  the  best  exposure  5  or  (>  feel  of  gray  and  red  mottled  clays  are  seen.  They 
are,  however,  full  of  rather  coarse  sand  and  are  probably  unfit  for  any  use. 
Near  the  northeast  end  of  Sugar  Loaf  Mountain  a  series  of  gray,  green,  and  reddish  shales 
is  exposed.  These  rocks  strike  N.  40°  E.  to  N.  50°  E.,  and  their  dip  varies  from  vertical  to 
70°  NW.  At  some  points  they  have  decayed  in  place  and  are  quite  soft  clays.  The  best 
deposits,  however,  lie  just  beyond  the  reservation  limits  and  have  been  opened  at  several 
points  there  as  well  as  in  pits  near  the  waterworks.  At  these  places  the  clays  have  been 
excavated  on  a  small  scale  for  various  purposes. 
Analyses  of  specimens  collected  from  these  pits  follow: 
Analyses  of  clays  from  mar  tin  /<  xt  /ration  line  it  ml  from  mar  the  waterworks. 
A 
B 
Silica 
73.96 
14.  54 
.34 
2.17 
.15 
70.  29 
1(1.74 
.01 
2. 03 
.10 
Lime 
Magnesia 
Soda 
Potash 
Combined  water 
Moisture 
.  49 
.80 
2.04 
3.70 
1.30 
1.50 
.08 
2.76 
5.  00 
1.12 
These  analyses  were  made  by  George  Steiger  in  the  Survey  laboratory.  A  is  of  clay  from 
the  pits  near  the  reservation  line  and  B  is  of  clay  from  t  he  pits  of  Mr.  Arthur  Furr,  near  the 
waterworks. 
The  most  promising  clay  deposits  of  the  district  lie  some  distance  north  of  those  which 
have  thus  far  been  discussed.  On  Cedar  Mountain,  near1  Mountain  Valley  post-office,  consid- 
erable work  has  been  done  in  opening  up  large  deposits  of  white  clays.  Two  large  cuts  and 
a  number  of  test  pits  give  a  good  opportunity  for  the  examination  of  this  property 
The  principal  or  eastern  opening  shows  30  to  40  feet  of  light-gray  clay  with  some  inter- 
bedded  light-yellowish  clays  and  a  few  layers  of  light-colored  sandstones.  This  series  dips 
northwest  at  low  angles  (10°  to  15°).  On  the  south  side  of  the  mountain  several  pits  show 
clay  beds  interbedded  with  heavy  sandstones.  The  clays  are  6  to  18  inches  thick,  and  the 
sandstones  about  the  same.  These  clays  are  mottled  red  and  gray,  but  as  they  have  been 
cut  into  for  only  a  few  feet  the  colors  may  change  in  further  work. 
