﻿612 
  F 
  ORTT-SEVENTH 
  REPORT 
  ON 
  THE 
  STATE 
  MUSEUM. 
  

  

  individual 
  characteristics, 
  but 
  these 
  are 
  not 
  conspicuous 
  features 
  ; 
  

   the 
  fucoidal 
  layers 
  of 
  Yanuxem 
  and 
  the 
  oolitic 
  layers 
  of 
  Sara- 
  

   toga 
  county 
  are 
  the 
  most 
  noteworthy, 
  exceptional 
  members. 
  

  

  Fine 
  exposures 
  of 
  the 
  Calciferous 
  are 
  very 
  frequent. 
  The 
  

   most 
  notable 
  are 
  as 
  follows 
  : 
  About 
  Middleville, 
  Little 
  Falls 
  and 
  

   northwestward 
  along 
  the 
  fault 
  scarp, 
  on 
  East 
  Canada 
  creek 
  (as 
  

   shown 
  in 
  plate 
  9); 
  about 
  St. 
  Johnsville 
  ; 
  along 
  the 
  Mohawk 
  from 
  

   Canajoharie 
  to 
  the 
  " 
  Noses 
  ; 
  " 
  the 
  quarries 
  at 
  Tribes 
  Hill 
  ; 
  along 
  

   the 
  Mohawk 
  from 
  Amsterdam 
  to 
  Hoffman's 
  Ferry 
  ; 
  along 
  the 
  

   fault 
  scarp 
  in 
  the 
  southwestern 
  corner 
  of 
  Saratoga 
  county 
  and 
  

   west 
  of 
  Saratoga 
  Springs. 
  The 
  formation 
  has 
  a 
  thickness 
  of 
  

   200 
  to 
  250 
  feet 
  on 
  the 
  Mohawk, 
  and 
  the 
  amount 
  appears 
  to 
  be 
  

   constant 
  over 
  a 
  wide 
  area. 
  The 
  fucoidal 
  layers 
  are 
  near 
  the 
  

   summit 
  of 
  the 
  formation 
  and 
  are 
  quarried 
  at 
  many 
  points 
  along 
  

   the 
  Mohawk. 
  The 
  oolitic 
  layers 
  are 
  best 
  developed 
  in 
  Saratoga 
  

   county, 
  where 
  they 
  were 
  first 
  described 
  by 
  Steele.* 
  

  

  A 
  conspicuous 
  and 
  interesting 
  feature 
  of 
  the 
  Calciferous 
  is 
  the 
  

   frequent 
  occurrence 
  of 
  cavities 
  containing 
  finely-developed 
  

   quartz 
  crystals, 
  together 
  with 
  more 
  or 
  less 
  calcite. 
  Anthracite 
  

   occurs 
  quite 
  frequently 
  in 
  these 
  cavities 
  and 
  in 
  the 
  quartz 
  

   crystals, 
  as 
  well 
  as 
  occasionally 
  in 
  thin 
  plates 
  on 
  bedding 
  planes, 
  

   particularly 
  in 
  the 
  Middleville, 
  Little 
  Falls 
  and 
  Canajoharie 
  

   regions. 
  

  

  According 
  to 
  Walcott 
  f 
  the 
  members 
  of 
  the 
  Calciferous 
  near 
  

   Saratoga 
  are 
  as 
  follows 
  : 
  

  

  Feet. 
  

  

  Massive 
  layers 
  of 
  steel 
  gray, 
  more 
  or 
  less 
  arenaceous 
  lime- 
  

   stone 
  125 
  

  

  Massive- 
  bedded, 
  slightly 
  magnesian, 
  gray 
  and 
  dove-colored 
  

   limestone 
  with 
  numerous 
  small, 
  narrow-chambered 
  ceph- 
  

   alopoda 
  near 
  the 
  summit 
  >. 
  35 
  

  

  Unfossiliferous, 
  impure, 
  compact, 
  more 
  or 
  less 
  silicious 
  lime- 
  

   stone 
  95 
  

  

  Dark-gray, 
  evenly-bedded 
  limestone 
  (with 
  a 
  Dicellocephalus 
  

   fauna) 
  50 
  

  

  Oolitic 
  limestone 
  30 
  

  

  * 
  Am. 
  Jour. 
  Science, 
  vol. 
  9, 
  pp. 
  16-18. 
  

  

  t 
  Correlation 
  papers, 
  Cambrian, 
  U. 
  8. 
  Geol. 
  Survey, 
  Bull. 
  No. 
  81, 
  p. 
  846. 
  

  

  