Ophiomorpha rudis (Ksiązkiewicz, 1977)

Description. Vertical, oblique to horizontal, endichnial or exichnial, straight, branched cylinders in marlstones, 6-10 mm in diameter, covered locally with irregular knobs. The cylinders are filled with sandstone from the overlying beds, which are located up to 90 cm above. The knobs,2 mm long and 1.5 mm wide, are arranged perpendicularly to the burrow axis. In one subvertical sandy cylinder (Fig. 4A, locality no. 1), a meniscate filling was observed.