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#1 Federal
Database for the Geologic Map of the Bonanza Caldera Area, Northeastern San Juan Mountains, Colorado
- Organization: Department of the Interior
- Dataset Last Updated: August 31, 2020 at 12:00 AM
The San Juan Mountains in southwestern Colorado have long been recognized as a site of exceptionally voluminous mid-Tertiary volcanism, including at least 24 major ignimbrite sheets (each...
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