Middle Ordovician Conodont Biostratigraphy of Australasia

• 作者: Yong Yi Zhen
• 来源期刊: 地球科学学刊（英文版）
• 年，卷（期）: 2021,（3）
• 页码范围: 474-485
• 页数: 12页
• 语种: 英文

摘要

Seven conodont biozones are recognized in the carbonate-dominated shelf-marine Middle Ordovician developed in the intracratonic sedimentary basins (Canning, Amadeus and Georgina) of central and north-western Australia, in the Lachlan and New England orogens of New South Wales, and in the Takaka Terrane of New Zealand. A separate scheme identifying seven conodont biozones spanning the Middle Ordovician has also been developed for siliciclastic sequences deposited in slope- basinal environments in the Lachlan Orogen in New South Wales and Victoria. This biozonal classifica-tion consisting of two parallel biostratigraphic schemes for the shelf-marine and deep-marine succes-sions respectively has significantly increased precision in regional and global biostratigraphic correla-tion and laid a solid foundation for the Middle Ordovician chronostratigraphy of Australia and New Zealand. Recognition of short-ranging pandemic species as the eponymous species of the biozones also supports direct correlation with the classical conodont successions established in Baltoscandia and the North American Midcontinent, and with those of the major Chinese terranes (South and North China and Tarim). The Lachlan Orogen appears to be globally unique in enabling correlation of contempora-neous conodont faunas over a considerable spectrum of water depths and biofacies ranging from car-bonate shelves, slopes to deep-water basins.