Description

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Silurian Reefs, 1992 (1:500,000) - Shows Silurian reefs, which are geologically significant in the exploration and development of oil and gas fields and industrial minerals. Digitized and modified from the following published map: Indiana Geological Survey Miscellaneous Map 54. This shapefile can be used in conjunction with SILURIAN_REEF_POLYGONS_MM54_IN.SHP.

Dataset Attributes

  • OBJECTID
    Number
  • Description (IGS MM54)
    Text
    {"value"=>"Buried reef (discreet reef masses generally not shown in Fort Wayne and Terre Haute Reef Bank areas)", "count"=>205} (), {"value"=>"Exposed reef", "count"=>120} (), {"value"=>"Reef-induced structure in overlying rocks related to oil, gas, and gas storage fields", "count"=>72} (), {"value"=>"Reef-induced structure in overlying rocks", "count"=>30} (), {"value"=>"Exposed reef in active stone quarry", "count"=>17} ()
  • Name of Associated Petroleum Field
    Text
    {"value"=>"Zoar", "count"=>1} (), {"value"=>"Worthington", "count"=>1} (), {"value"=>"Wilfred", "count"=>1} (), {"value"=>"West Point", "count"=>1} (), {"value"=>"Washington", "count"=>1} (), {"value"=>"Troy", "count"=>1} (), {"value"=>"Terre Haute South", "count"=>1} (), {"value"=>"Terre Haute East", "count"=>1} (), {"value"=>"Terre Haute", "count"=>1} (), {"value"=>"Switz City", "count"=>1} ()
  • Shape
    Number
  • GlobalID
    Number

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