Alfred Hannam Bell, John Everts Lamar, Walter Henry Voskuil, Daniel Jerome Fisher, Fay VaNisle Tooley, George Elbert Ekblaw, George Vincent Cohee, Gilbert Haven Cady, Glenn Charles Finger, Illinois State Geological Survey, James Morton Schopf, John Rice Ball, L. C. McCabe, L. D. McVicker, Lewis E. Workman, William Albert Newton, Frank H. Reed, G. N. Oliver, H. B. Willman, R. J. Piersol · 1932