Authors Year Title
House & Ziegler 1977 The Goniatite and Conodont sequences in the early Upper Devonian at Adorf, Germany.
Geologica et Palaeontologica, 11: 69-108, fig.1-4, pl.1-6; Marburg.
Korn & Ziegler 2002 The ammonoid and conodont zonation at Enkenberg (Famennian, Late Devonian; Rhenish Mountains.
Senckenbergiana lethaea, 82: 453-462, 5 fig., Frankfurt am Main.
Kullmann & Ziegler 1970 Conodonten und Goniatiten von der Grenze Mittel-/Oberdevon aus dem Profil am Martenberg (Ostrand des Rheinischen Schiefergebirges).
Geologica et Palaeontologica, 4: 73-85, fig.1-5, tab.1, pl.1; Marburg.