1. ASHLEY, J.W., 1991?, The nature of the Conllindale Depression. Copy of an unpublished report received from the author in 1996 with no references to source, Figure 8.
2. BLACK, T.J., 1983, Selected views of tectonics, structure, and karst in Northern Lower Michigan,in R.E. Kimmel (ed.) Tectonics, Structure, and Karst in Northern Lower Michigan. Michigan Basin Geological Society Fieldtrip Guidebook, p. 11–35.
3. BLACK, T.J., 1995, Karst geology of the Northeast Lower Peninsula, Michigan, A Field Conference. Michigan Basin Geological Society Fieldtrip Guidebook, p. 22–23.
4. ELOWSKI, R.C. and OSTRANDER, A.G., 1977, Gypsum karst and related features in the Michigan Basin, Official 1977 Guidebook, Alpena, Michigan, National Speleological Society, p. 31–39.
5. LANDES, K.K., EHLERS, G.M., and STANLEY, G.M., 1945, Geology of the Mackinac Straits Region and Subsurface Geology of Northern Southern Peninsula:Michigan Geological Survey, Publication 44, Geological Series, p. 143–150.