	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.
	Korn & Tilsley	2006	Ammonoid assemblages from the Asbian B2b (Early Carboniferous: Mississippian) buildups of the Peak District, England. Proceedings of the Yorkshire Geological Society, 56 (2): 111-150, 30 fig., 16 tab.