Ordovician graptolite faunas in Australia

Three Australian Ordovician graptolite faunas are described; the short‐lived Anisograptid Fauna is followed by the Dichograptid Fauna, which in turn is succeeded by the Diplograptid Fauna. The Dichograptid Fauna consists of two sub‐faunas, the Tetragraptus‐Didymograptus and the Isograptid; the Diplograptid Fauna consists of the Glyptograptus‐Amplexograptus and the Leptograptus‐Orthograptus sub‐faunas. The Diplograptid Fauna becomes extinct low in the Silurian, giving way to the Monograptid Fauna, which persists into the Devonian.