- Data source
- Input directly
The boundary was digitized from a map published in Smith and Bustin, 1997 (Regional Sedimentology and Stratigraphy of th eUpper Devonian and Lower Mississippian Bakken Formation, Williston Basin, Saskatchewan Geological Survey Open File Report 96-1) and Smith and Bustin, 2000 (Late Devonian and early Mississippian Bakken and Exshaw black shale source rocks, Western Canada Sedimentary Basin–a sequence stratigraphic interpretation: American Association of Petroleum Geologists Bulletin, 84, no. 7, p. 940–960). We used the Sweetgrass Arch as the western boundary.