Heterophrentis from the Silica Shale

Heterophrentis is a common rugose coral found throughout much of the Devonian. I've found a couple of specimens that I think are Heterophrentis simplex on the Silica Shale dumps in Sylvania.







Another, larger specimen that shows some crushing. I'm not sure when the damage occured, before or after burial.







My ID is based on the 1975 book by Robert V. Kesling & Ruth B. Chilman: Strata and Megafossils of the Middle Devonian Silica Formation: Museum of Paleontology, Papers on Paleontology, No. 8, pg. 47, pl. 3, 4, 6.