Graptolithina

Dichograptidae Lapworth, 1873

Selection of related publications
Bergström, S. M., Löfgren, A., Maletz, J. 2004. The GSSP of the Second (Upper) Stage of the Lower Ordovician Series: Diabasbrottet at Hunneberg, Province of Västergötland, Southwestern Sweden. Episodes 27, 4, 265-272.
Kaljo, D. L., Kivimägi, E. K. 1976. Zonal stratigraphy of the Estonian Tremadocian. Graptolites and Stratigraphy, pp. 53-63.
Kaljo, D. 1974. On graptolite zones of Tremadoc and Arenig of Pribaltic and Moscow syneclises. Graptolites of the USSR, pp. 31-36.
Obut, A. M. 1960. Correlation of some parts of Estonian Ordovician and Silurian deposits according to graptolites. ENSV TA Geoloogia Instituudi uurimused V, 143-157. Eesti NSV Teaduste Akadeemia Geoloogia Instituudi Uurimused V, pp. 143-157.
Obut, A. M. 1957. Kassifikaciâ i ukazatel' rodov graptolitov. Ežegodnik Vsesoûznogo Paleontologičeskogo Obŝestva XVI, 11-47.