National Geologic Map Database
General Information
- Title: Structure contour map on top of the middle member of the Piper formation of Middle Jurassic age in the Williston Basin and adjacent areas in Montana, North Dakota, and South Dakota
- Author(s): Sandberg, D.T.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Oil and Gas Investigations Map OM-179
- Publication Date: 1959
- Map Scale: 1:760,320
- Cross Section: Yes
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- For more information, please contact:
- U.S. Geological Survey
- USGS Information Services
- Box 25286
- Denver, CO 80225
- Phone: (303) 202-4700 or 1-888-ASK-USGS
- Fax: (303) 202-4710
* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.