Authors Year Title
Bisat 1952 The goniatite succession at Cowdale Clough, Barnoldswick, Yorkshire.
Transactions of the Leeds Geologists Association, 6 (4): 155-181, fig.1-3, pl.1-3; Kendal.
Campbell, Brown & Coleman 1983 Ammonoids and the correlation of the lower Carboniferous rocks of eastern Australia.
Alcheringa, 7(2): 75-123, fig.1-49, pl.1-7; Sydney.
Korn 1997 The Palaeozoic ammonoids of the South Portuguese Zone.
Memórias do Instituto geológico e Mineiro 33: 1-131, 69 text-figs., 16 pls., Lisboa.
Pareyn 1961 Les Massifs Carbonifères du Sahara Sud-Oranais. Tome II. Paléontologie stratigraphique.
Publications Centre Rech. Sahariennes, Ser. Géologie, 1: 1-244, fig.1-27, pl.1-28; Paris.