Fig. 1 in A new type of colony in Silurian (upper Wenlock) retiolitid graptolite Spinograptus from Poland

Fig. 1. Stratigraphical sequence of the Spinograptus species, with new data from this paper and Kozłowska−Dawidziuk 1997: fig. 12. The ranges of Spinograptus spinosus (Wood, 1900) and S. clathrospinosus Eisenack, 1951 reach the Saetograptus linearis–Monograptus ceratus Biozone in the Arctic Canada (Lenz and Kozłowska−Dawidziuk 2004), which is not marked herein.