National Geologic Map Database
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
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