Within the Waldron shale, rugose corals are not particularly common. All I've found so far is a small species that rarely exceeds an inch in length (as far as specimens I have found). The sides are striated vertically and typically the whole calice is very straight with only a slight curve to it. Mike over at Louisville Fossils indicates that these are in the family Metriophyllidae.
I've found a similar fossil in the Irondequoit limestone Rochester Shale near Lockport, NY called Enterolasma calculum. The Irondequoit limestone and Waldron shale are similar in age with the Irondequoit being a little older.