1980  Kullmann & Ramovs: 196, fig.1. Dark grey or black micaceous shales with fine-grained sand. Nautiloids,
               Schistoceras  (uppermost Gzhelian), Mescalites (lowermost Asselian) and different coiled and orthocone
               nautiloids as well as trilobites, fusulinids. Section insufficiently known.