	Authors	Year	Title
	Ebbighausen, Bockwinkel & Becker	2004	Late Emsian and Eifelian stratigraphy at Oufrane (Tata region, eastern Dra Valley, Morocco. [Ebbighausen,V., Bockwinkel,J., Becker, R.T., Aboussalam,Z.S., Bultynck,P., El Hassani,A. & Nübel,H. Devonian Neritic-Pelagic correlation and events in the Dra Valley (Western Anti-Atlas, Morocco, A. El Hassani, ed., Docum.Inst.Scient., 19: 44-52, 2 pl.,3 fig., Rabat.
	House	1962	Observations on the ammonoid succesion of the North American Devonian. Journal of Paleontology, 36: 247-284, fig.1-15, tab.1-3, pl.43-48; Tulsa, Okla.
	Klug	2002	Quantitative stratigraphy and taxonomy of late Emsian and Eifelian ammonoids of the eastern Anti-Atlas (Morocco). Courier Forschungsinstitut Senckenberg, 238: 1-109, 44 fig., 13 pl., 23 tab., Frankfurt.
	Matern	1931b	Die Goniatiten-Fauna der Schistes de Matagne in Belgien. Bulletin du Musée royal d`Histoire naturelle de Belgique, 7, 13: 1-15, fig.1,2; Bruxelles.
	Petter	1959	Goniatites dévoniennes du Sahara. Publ. Serv. Carte géol. Algérie, n.s., Paléont., 2: 1-313, fig.1-58, pl.1-26; Alger.
	Termier & Termier	1950	Paléontologie Marocaine. II. Invertébrés de l'ére Primaire. Fascicule III. Mollusques. Service géologique Protect. Rep. franc. Maroc, Notes et Mém., 78: 1-246, pl.123-183; Paris.