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General Information

  • Title: The Helderberg Group and the position of the Silurian-Devonian boundary in North America
  • Author(s): Berdan, J.M.
  • Publishing Organization: U.S. Geological Survey
  • Series and Number: Bulletin 1180-B [p. B1-B19]
  • Larger Work: Contributions to stratigraphic paleontology
  • Publication Date: 1964
  • Map Scale: 1:6,034,286
  • Cross Section: Yes
  • North Latitude: 42° 55' 50" N (42.9306)
  • South Latitude: 41° 21' 35" N (41.3597)
  • East Longitude: 74° 3' 55" W (-74.0653)
  • West Longitude: 75° 6' 40" W (-75.1111)
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