Authors Year Title
Bisat 1934 The goniatites of the Beyrichoceras zone in the north of England.
Proceedings of the Yorkshire Geological Society, 22: 280-309, fig.1-27, pl.17-24; Leeds.
Moore 1936 The Bowland Shales from Pendle to Dinckley.
Journal of the Manchester Geological Association,: 167-192, fig.1-3, pl.1-3; Manchester.
Moore 1946 The Carboniferous goniatite genera Girtyoceras and Eumorphoceras.
Proceedings of the Yorkshire Geological Society, 25: 387-445, 31 figs., pl.22-27; Wakefield.