Late Tremadoc to early Arenig graptolite faunas of southern Bolivia and their implications for a worldwide biozonation

The graptolite faunal succession of the late Tremadoc to early Arenig in so uthern Bolivia is established from the Cieneguillas and Culpina sections an d compared with faunas from other regions. The succession yields important data for the discussion on the proposed GSSP at the base of the Tetragraptu s approximatus Zone and the completeness of the successions in eastern Nort h America and Scandinavia. The graptolite faunas of the Aorograptus victori ae, Kiaerograptus supremus, Araneograptus murrayi, Hunnegraptus copiosus an d Tetragraptus phyllograptoides zones are reviewed and the faunal associati ons discussed. The Kiaerograptus supremus Zone is regarded as a local Scand inavian biozone.