	Authors	Year	Title
	Moore	1936	The Bowland Shales from Pendle to Dinckley. Journal of the Manchester Geological Association,: 167-192, fig.1-3, pl.1-3; Manchester.
	Riley	1985	Asturoceras and other dimorphoceratid ammonoids from the Namurien (E2) of Lancashire. Proceedings of the Yorkshire Geological Society, 45 (3): 219-224, fig.1-8.