National Geologic Map Database
General Information
- Title: The Ordovician-Silurian boundary
- Author(s): Ulrich, E.O.
- Publishing Organization: American Geophysical Union
- Series and Number: International Geological Congress, 12th, Toronto, 1913, Report [p. 593-667]
- Publication Date: 1913
- Cross Section: None
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Geologic units referred to in Geolex
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