﻿INDEX 
  TO 
  GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  175 
  

  

  Ordovicic 
  history, 
  137-38 
  

   Orthis 
  salemensis, 
  67 
  

   Orthoceras 
  arcuolineatum, 
  50 
  

  

  hudsonicum, 
  50 
  

   Orthodesma 
  subcarinatum, 
  96 
  

   Oxydiscus 
  sp., 
  77 
  

   Ozarkic 
  system, 
  32 
  

  

  Pachydictya 
  acuta 
  var., 
  47 
  

   Paleozoic 
  history, 
  136; 
  later, 
  142-43 
  

   Paleozoic 
  rocks 
  of 
  the 
  eastern 
  

  

  trough, 
  by 
  R. 
  Ruedemann, 
  66-99 
  

   Paleozoic 
  rocks 
  of 
  the 
  western 
  

  

  trough, 
  by 
  H. 
  P. 
  Cushing, 
  30-32 
  

   Paleschara 
  ulrichi, 
  96 
  

   Parastrophia 
  hemiplicata, 
  96 
  

   Pegmatite, 
  18, 
  22-23, 
  25 
  

   Pelagiella 
  hoyti, 
  42 
  

  

  minutissima, 
  42 
  

   Peneplain, 
  8 
  

   Phlogopite, 
  20 
  

   Phyllodictya 
  varia, 
  47 
  

   Plaesiomys 
  retrorsa, 
  96 
  

   Plagioclase, 
  18 
  

   Platyceras 
  primaevum, 
  72 
  

   Plectambonites 
  pisum, 
  80, 
  81, 
  82 
  

  

  sericeus, 
  97, 
  98, 
  99 
  

   typus, 
  96 
  

   Plectorthis 
  cf. 
  whitfieldi, 
  96 
  

   Pleistocene 
  history, 
  146-48 
  

   Polytoechia 
  apicalis, 
  77 
  

   Pontobdellopsis, 
  98 
  

  

  cometa, 
  50, 
  98 
  

   Porter 
  Corners, 
  20, 
  44; 
  graphite, 
  148 
  

   Potsdam 
  sandstone, 
  31, 
  32, 
  34-35, 
  

  

  58, 
  59, 
  60, 
  63, 
  136-37, 
  141, 
  165 
  

   Precambric 
  rocks, 
  16-30 
  

   Proetus 
  undulostriatus, 
  97, 
  98 
  

   Prosser, 
  C. 
  S., 
  cited, 
  38, 
  46, 
  54, 
  56, 
  

  

  59 
  

   Protorthis 
  minima, 
  77 
  

   Protospongia, 
  67 
  

   Pterotheca 
  cf. 
  canaliculata, 
  97 
  

   Ptychoparia, 
  37 
  

  

  matheri, 
  38 
  

   Pyrite, 
  20 
  

   Pyroxene. 
  18, 
  20, 
  28 
  

  

  Quaker 
  Springs, 
  87, 
  152 
  

   Quartz, 
  18, 
  20, 
  21, 
  23, 
  28 
  

   Quartz-feldspar, 
  19 
  

   Quartz-pyroxene, 
  19 
  

   Quartzites, 
  17, 
  19 
  

  

  Rafinesquina 
  sp., 
  80 
  

   alternata, 
  76, 
  96, 
  97 
  

  

  Rensselaer 
  county, 
  table 
  showing 
  the 
  

   Lower 
  Cambric 
  series, 
  68 
  

  

  Retiograptus 
  geinitzianus, 
  92 
  

  

  Rhinidictya 
  mutabilis, 
  47 
  

  

  Rock 
  City 
  Falls, 
  46, 
  101, 
  151; 
  fault, 
  

   50-60 
  

  

  Rose 
  quartz, 
  23 
  

  

  Rowlands 
  Mill, 
  46, 
  151 
  

  

  Ruedemann, 
  R., 
  Canajoharie 
  shale, 
  

   48-51 
  ; 
  Control 
  of 
  development 
  and 
  

   history 
  of 
  Saratoga 
  region 
  by 
  the 
  

   geology, 
  168-70 
  ; 
  Paleozoic 
  rocks 
  

   of 
  the 
  eastern 
  trough, 
  66-99; 
  

   Relation 
  of 
  the 
  Saratoga 
  mineral 
  

   springs 
  to 
  structure 
  of 
  the 
  shale 
  

   belt 
  of 
  the 
  upper 
  Hudson 
  valley, 
  

   165-67 
  ; 
  Structural 
  geology 
  of 
  the 
  

   shale 
  belt, 
  99-115; 
  work 
  on 
  Schuy- 
  

   lerville 
  quadrangle, 
  6; 
  classifying 
  

   and 
  mapping 
  shales, 
  6 
  ; 
  cited. 
  42, 
  

   48, 
  74, 
  81, 
  152, 
  157 
  

  

  & 
  Cushing, 
  H. 
  P., 
  Historical 
  

  

  geology, 
  135-48 
  

  

  Rysedorph 
  hill, 
  81 
  

  

  Rysedorph 
  Hill 
  conglomerate, 
  66, 
  

   80-84, 
  93, 
  105, 
  108, 
  113, 
  142 
  

  

  Sacandaga 
  creek, 
  12 
  

  

  St 
  Clements, 
  61 
  

  

  St 
  Johnsville, 
  10 
  

  

  Sand 
  terraces, 
  14 
  

  

  Sandstones, 
  7 
  

  

  Saratoga 
  fault, 
  60, 
  61-62 
  

  

  Saratoga 
  Graphite 
  Co., 
  149 
  

  

  Saratoga 
  lake, 
  15 
  

  

  Saratoga 
  quadrangle, 
  location 
  and 
  

  

  character, 
  6-7; 
  part 
  of, 
  mapped 
  

  

  by 
  W. 
  J. 
  Miller, 
  5 
  

   Saugerties, 
  115 
  

   Scapolite, 
  20 
  

  

  