1. Barratt, M. W., 1981, Recent exploration activity in Michigan: Ontario Petroleum Institute, Twentieth Annual Conference, Technical Papers, no. 6, p. 1–31.
2. Beards, R. J., 1967, Guide to the subsurface Paleozoic stratigraphy of southern Ontario: Ontario Department of Energy and Resource Management, Paper 67-2, 19 p.
3. Pre-Knox (Cambrian) stratigraphy in Indiana;Becker;Indiana Geological Survey Bulletin 57,1978
4. Selected studies of Cambro-Ordovician sediments within the Michigan Basin;Bricker;Michigan Geological Survey Report of Investigation,1983
5. Brigham, R. J., 1971, Structural geology of southwestern Ontario and southeastern Michigan: Ontario Department of Mines and Northern Affairs, Paper 71-2, 110 p.