Helderberg Group and the position of the Silurian-Devonian boundary in North America
By: by Jean M. Berdan.
Contributors: Geological Survey (U.S.)
Series: U.S. Geological Survey bulletin -- 1180-B; Contributions to stratigraphic paleontology
Publisher: U.S. Government Printing Office
Published: 1964
Place of publication: Washington, DC
Language: eng
Number of pages: 19
Subjects: Geology, Stratigraphic -- Devonian.; Geology, Stratigraphic -- Silurian.; Geology -- United States.
Notes: Bibliogr.

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