National Geologic Map Database
General Information
- Title: Geologic map of the East Portal quadrangle, Boulder, Gilpin, and Grand Counties, Colorado
- Author(s): Young, E.J.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Miscellaneous Investigations Series Map I-2212
- Publication Date: 1991
- Map Scale: 1:24,000
- Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.