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  MasstTM. 
  

  

  brown 
  spots. 
  In 
  lower 
  lands 
  to 
  the 
  west 
  there 
  is 
  a 
  Caleiferous 
  

   area 
  separated 
  by 
  the 
  fault 
  which 
  extends 
  from 
  near 
  Mayfield, 
  

   but 
  Cranberry 
  creek 
  cuts 
  through 
  to 
  the 
  Potsdam 
  members. 
  

   These 
  are 
  dark 
  gray 
  to 
  buff 
  quartzitic 
  beds 
  with 
  a 
  thin 
  interca- 
  

   lated 
  bed 
  of 
  dark 
  shales. 
  They 
  are 
  traversed 
  by 
  a 
  gentle 
  synclinal 
  

   near 
  the 
  road 
  bridge 
  and 
  appear 
  to 
  be 
  cut 
  off 
  by 
  the 
  fault 
  just 
  

   east. 
  

  

  On 
  the 
  road 
  from 
  Cranberry 
  creek 
  to 
  Mayfield 
  the 
  Potsdam 
  

   beds 
  are 
  again 
  brought 
  up 
  together 
  with 
  underlying 
  crystalline 
  

   rocks 
  apparently 
  by 
  the 
  cross 
  fault. 
  They 
  are 
  exposed 
  to 
  a 
  thick- 
  

   ness 
  of 
  forty 
  feet 
  up 
  the 
  slope 
  along 
  the 
  small 
  stream 
  by 
  the 
  

   road 
  and 
  consist 
  of 
  sandstones 
  and 
  quartzites 
  of 
  the 
  usual 
  char- 
  

   acter. 
  They 
  are 
  overlaid 
  by 
  Caleiferous 
  sandrock 
  to 
  the 
  west 
  

   and 
  are 
  cut 
  off 
  by 
  the 
  fault 
  to 
  the 
  south 
  and 
  east. 
  The 
  relations 
  

   of 
  the 
  formation 
  in 
  the 
  Osborn's 
  bridge 
  — 
  Mayfield 
  region 
  are 
  

   shown 
  in 
  figure 
  1. 
  

  

  Fig. 
  1.— 
  Sketch 
  map 
  of 
  region 
  north 
  of 
  Mayfield 
  and 
  sections 
  illustrating 
  the 
  relations 
  of 
  the 
  

   faults. 
  Horizontal 
  scale 
  2 
  miles 
  to 
  linch. 
  U., 
  Utica 
  slate; 
  T., 
  Trenton 
  limestone; 
  C, 
  Calei- 
  

   ferous 
  sandstone; 
  P., 
  Potsdam 
  sandstone; 
  A., 
  Crystalline 
  rocks; 
  F., 
  Faults. 
  

  

  The 
  Potsdam 
  at 
  "Wells 
  on 
  the 
  upper 
  Sacandaga 
  is 
  exposed 
  in 
  

   considerable 
  force 
  just 
  east 
  of 
  the 
  lower 
  part 
  of 
  the 
  village. 
  It 
  

   consists 
  of 
  a 
  somewhat 
  calcareous 
  sandstone 
  weathering 
  to 
  a 
  

  

  