original description
Stauffer, C. R.; Schroyer, C. R. (1920). The Dunkard Series of Ohio. <em>Geological Survey of Ohio Bulletin, fourth series.</em> 22: 1-167.
page(s): 145, pl. 11, figs 17-21 [details]
From editor or global species database
Type locality From the shales at the base of the Lower Washington Limestone, one-half mile south of
Pleasant Grove, Belmont County, Ohio (USA) [details]