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National Geologic Map Database

General Information

  • Title: Index to the stratigraphy of North America accompanied by a geologic map of North America
  • Author(s): Willis, Bailey
  • Publishing Organization: U.S. Geological Survey
  • Series and Number: Professional Paper 71
  • Publication Date: 1912
  • Map Scale: 1:5,000,000
  • Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.