Piper, J.D., 1983, Dynamics of the continental crust in Proterozoic times, in Medaris, L.G., Jr., Byers, C.W., Mickelson, D.M., and Shanks, W.C., eds., Proterozoic geology: Selected papers from an International Proterozoic Symposium: Geological Society of America Memoir 161, p. 11-34.