THE EVONIAN-CARBONIFEROUS BOUNDARY BASED ON LOWER CARBONIFEROUS CONODONTS IN GUIZHOU

On the basis of the correlation of conodont, brachiopod and coral fossils contained in EarlyCarboniferous strata of platform facies in Duoshan and basinal facies in Muhua, Guizhou, the au-thor holds that the Devonian-Carboniferous boundary should be placed at the base of the GedaoheFormation. The main grounds are as follows: （1） the conodonts Bispathodus aculeatus and B. an-teposicornis in the Zhewang Formation first appear in the terminal Late Devonian WocklumeiaZone; （2） the stromatoporoids Pseudolebechia cumpacta, Stromatocerium eximium and Actinostro-ma contortum occurring in the Zhewang Formation are very similar to those from the Etroeungti-am （Late Devonian） bed of Western Europe; （3） the brachiopods, corals and conodonts in theGelaohe Formation have a close phylogenetic relation with some taxa in the Tangbagou Formationbut are notably different from those in the underlying Zhewang Formation. Therefore, the authorsuggests that the Devonian-Carboniferous boundary should be placed at the base of theCystophrentis -Compsite-Shuchertella Zone.