National Geologic Map Database
General Information
- Title: Correlation chart of Lower and Upper Cretaceous Blackleaf Formation, eastern Pioneer Mountains, southwestern Montana, to Drummond, central-western Montana
- Author(s): Dyman, T.S., Tysdal, R.G., Wallace, C.A., and Lewis, S.E.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Miscellaneous Investigations Series Map I-2478
- Publication Date: 1994
- Map Scale: 1:1,860,000
- Cross Section: Yes
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