	Authors	Year	Title
	House	1993	Earliest Carboniferous goniatite recovery after the Hangenberg Event. Annales de la Societé géologique de Belgique, 115 (2): 559-579, fig.1-2, pl.1-5; Bruxelles.
	Matthews	1983	An occurrence of Lower Carboniferous (Gattendorfia-Stufe) ammonoids in southwest Ireland. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, 1983, H.5: 293-299, fig.1-2; Stuttgart.