﻿GEOLOGICAL 
  SURVEY 
  OF 
  THE 
  STATE 
  OF 
  NEW 
  YORK. 
  

  

  (GEOLOGICAL 
  MAP.) 
  

  

  The 
  Economic 
  Geology 
  of 
  Albany 
  County. 
  

  

  By 
  Frank 
  L. 
  Nason. 
  

  

  James 
  Hall, 
  State 
  Geologist: 
  

  

  Sib.— 
  There 
  are 
  no 
  metal 
  mines 
  in 
  Albany 
  county. 
  The 
  

   sources 
  of 
  wealth 
  contained 
  in 
  the 
  geological 
  formations 
  are 
  con- 
  

   fined 
  to 
  quarries, 
  clay 
  and 
  sand 
  banks, 
  and 
  to 
  the 
  water 
  power 
  

   developed 
  by 
  such 
  streams 
  as 
  the 
  Mohawk, 
  Normanskill 
  and 
  

   several 
  minor 
  streams. 
  Geologically, 
  each 
  of 
  the 
  products 
  men- 
  

   tioned 
  may 
  be 
  referred 
  to 
  a 
  definite 
  age. 
  

  

  I. 
  Limestones 
  and 
  shales, 
  confined 
  to 
  the 
  Silurian, 
  next 
  to 
  the 
  

   oldest 
  palaeozoic 
  formation. 
  

  

  II. 
  Flagstones 
  of 
  the 
  Hamilton 
  group 
  of 
  rocks 
  ; 
  Devonian 
  in 
  age. 
  

  

  III. 
  Gravels, 
  clays, 
  molding 
  sands; 
  confined 
  to 
  the 
  Quater- 
  

   nary, 
  the 
  most 
  recent 
  geological 
  age. 
  

  

  The 
  sources 
  of 
  geological 
  wealth 
  may 
  then 
  be 
  divided 
  as 
  in 
  

   the 
  following 
  table: 
  

  

  Geological 
  age. 
  Material. 
  Uses. 
  

  

  f 
  Building 
  and 
  dimension 
  stone, 
  

  

  Silurian 
  Limestone 
  . 
  J 
  bridge, 
  ashlar, 
  crushed 
  stone 
  

  

  or 
  road 
  metal, 
  lime, 
  and 
  Port- 
  

   ly 
  land 
  cement. 
  

  

  Devonian 
  Cauda-galli 
  grit 
  i 
  Road 
  material 
  ( 
  n 
  ot 
  road 
  metal 
  

  

  QM 
  . 
  \ 
  or 
  crushed 
  stone). 
  

  

  bilunan 
  Hydraulic 
  limestones 
  . 
  . 
  . 
  Hydraulic 
  cement. 
  

  

  Devonian 
  Flagstones 
  and 
  sand- 
  ( 
  Flag 
  '? 
  i 
  "^. 
  fo 
  1 
  r 
  sid 
  ^ 
  w 
  alks, 
  door 
  

  

  (Hamilton 
  group). 
  stones 
  1 
  and 
  ™idow 
  sills, 
  curbs, 
  

  

  ( 
  posts, 
  water 
  tables, 
  etc. 
  

   j 
  Mortar 
  and 
  cement, 
  brick 
  and 
  

  

  Quaternary 
  Building 
  or 
  quicksands 
  \ 
  I 
  1 
  ®' 
  as 
  P 
  halt 
  pavements 
  and 
  

  

  ^ 
  sidewalks, 
  sand 
  and 
  gravel 
  

  

  [ 
  walks 
  and 
  drives. 
  

   (( 
  ( 
  Molding 
  sand 
  for 
  light, 
  me- 
  

  

  Molding 
  sands 
  -j 
  dium 
  and 
  heavy 
  castings, 
  

  

  ( 
  brass, 
  iron, 
  bronze 
  or 
  steel. 
  

  

  " 
  Qj 
  ay 
  j 
  Bricks, 
  til 
  s. 
  pottery, 
  glazing, 
  

  

  XT 
  /. 
  ' 
  I 
  modeling, 
  etc. 
  

  

  JNo 
  particular 
  geo- 
  ) 
  w&ter 
  ] 
  Water 
  power, 
  navigation, 
  irri- 
  

  

  logicai 
  age 
  j 
  "j 
  gation, 
  medicinal 
  springs. 
  

  

  