National Geologic Map Database
Title: Champlainian Series (Middle Ordovician) in Illinois
Author(s): Templeton, J.S., and Willman, H.B.
Publishing Organization: Illinois State Geological Survey
Series and Number: Bulletin no. 89 [260 p.]
- Publication Date: 1963
- Cross Section: None
- 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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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.