	Authors	Year	Title
	Kullmann	1993	Paleozoic ammonoids of Mexico and South America. Comptes Rendus XII ICC-P, Vol.1: 557-562, fig.1-2; Buenos Aires.
	Thomas	1928	An Upper Carboniferous Fauna from the Amotape Mountains, North-Western Peru. Geological Magazine 65: 146-152, 215-234, 289-301, pls.5-6, 1928; 67: 394-408, pl.24, 1930.