UW-Green Bay Prof. John Luczaj (Geology, Geoscience) will appear in a documentary about the Niagara Escarpment that premieres this week. The documentary is titled “The Great Ledge” by Dan Larson. The Niagara Escarpment is a geologic feature that runs from Wisconsin through Michigan and Ontario into New York state. It is the same ledge over which the Niagara River flows producing Niagara Falls. The documentary will be shown from 6:30 to 8 p.m. Wednesday, April 26 at the De Pere Cinema ($10 fundraiser), 417 George St. and from 1:30 to 3 p.m. Saturday, April 29 at The Clearing, 12171 Garrett Bay Road, Ellison Bay. (Free).