National Geologic Map Database
General Information
- Title: Megagroups in Illinois
- Author(s): Swann, D.H., and Willman, H.B.
- Publishing Organization: American Association of Petroleum Geologists
- Series and Number: Bulletin v. 45, no. 4 [p. 471-483]
- Publication Date: 1961
- Cross Section: Yes
- North Latitude: 42° 30' 30" N (42.5083)
- South Latitude: 36° 58' 13" N (36.9703)
- East Longitude: 87° 29' 47" W (-87.4964)
- West Longitude: 91° 30' 47" W (-91.5131)
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- American Association of Petroleum Geologists
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- Tulsa, OK 74101-0979
- Phone: 1-800-364-2274
- Fax: 1-918-560-2665
* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.