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.
Garcia-Alcalde, Arbizu & García_López 1990d Devonian stage boundaries (Lochkovian/Pragian, Pragian/Emsian, and Eifelian (Givetian) in the Cantabric region (NW Spain).
Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 180 (2): 177-207, fig.1-12; Stuttgart.
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.
Korn & Klug 2002 Ammoneae Devonicae.
In: Fossilium Catalogus, I: Animalia (edit. Riegraf,W.), Pars 138:
375 p., 238 fig., 4 tab., Leiden (Backhuys Publ.).
Montesinos 1988a Agoniatitina y Anarcestina del Devónico Medio de la Cordillera Cantabrica (Dominios Palentino y Asturleonés, NO de España).
Cuad. Lab. Xeol. de Laxe Coruña, 12: 99-118, fig.1-4, pl.1-2; Coruña.
Petter 1959 Goniatites dévoniennes du Sahara.
Publ. Serv. Carte géol. Algérie, n.s., Paléont., 2: 1-313, fig.1-58, pl.1-26; Alger.