Text-fig. 1. Graptolite biostratigraphy of the Silurian showing the up to present documented occurrences of scolecodonts in the Prague Basin. The graptolite zones are shown proportionally to the supposed relative time length (chart after Kříž 1992; Štorch 2001). in Revision Of Kettnerites Žebera, 1935 (Scolecodonta, Silurian Of The Barrandian Area, Czech Republic): Preliminary Results

Text-fig. 1. Graptolite biostratigraphy of the Silurian showing the up to present documented occurrences of scolecodonts in the Prague Basin. The graptolite zones are shown proportionally to the supposed relative time length (chart after Kříž 1992; Štorch 2001).