	Authors	Year	Title
	Hind	1918	On the distribution of the British Carboniferous Goniatites, with a description of one new genus and some new species. Geological Magazine, 5 (10): 434-450, pl.16; London.
	Riley	1987	Type ammonoids from the Mid-Carboniferous boundary interval in Britain. Courier Forschungsinstitut Senckenberg, 98: 25-37, fig.1-8, pl.1,2; Frankfurt a.M.
	Riley, Varker & Owens	1987	Stonehead Beck, Cowling, Yorkshire, England: A British proposal for the Mid-Carboniferous boundary stratotype. Courier Forschungsinstitut Senckenberg, 98: 159-177, fig.1-7, pl.1-3; Frankfurt a.M.