National Geologic Map Database
Product Description Page
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Title: Geologic map of the East Portal quadrangle, Boulder, Gilpin, and Grand Counties, Colorado
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Author(s): Young, E.J.
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Publishing Organization: U.S. Geological Survey
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Series and Number: Miscellaneous Investigations Series Map I-2212
- Publication Date: 1991
- Map Scale: 1:24,000
- Cross Section: None
- North Latitude: 40° 0' 0" N (40.0000)
- South Latitude: 39° 52' 30" N (39.8750)
- East Longitude: 105° 37' 30" W (-105.6250)
- West Longitude: 105° 45' 0" W (-105.7500)
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.