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Two excellent explanations of the geologic history of
Pennsylvania and the northeastern United States are:
• Barnes, J. H., and W. D. Sevon,
The Geological Story of Pennsylvania, Educational
Series 4, 53 pp., Pennsylvania Geological Survey, Harrisburg, 2014.
• Paleontological Research Institution, Teacher-Friendly
Guide to the Geology of the Northeast.
Last revised: 13 October 2023