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- W1565969832 abstract "Distinct differences between the Ordovician nautiloid faunas of separate regions of Australia reflect differences in environmental and tectonic setting. The earliest nautiloids from Tasmania are late Early Ordovician (late Ibexian) and are dominantly Asiatic in character (Manchuroceras, Yehlioceras) as are the early Middle Ordovician (early-middle Whiterockian) faunas (Wutinoceras, Armenoceras). However, by the latest Whiterockian-earliest Mohawkian the faunas become increasingly endemic (dominated by the Gouldo-ceratidae), and only rare cosmopolitan forms are present (Discoceras). This increase in endemism reflects the extended isolation of the extremely shallow water carbonate platform in Tasmania. It was isolated by deep water, and only nektonic forms were able to cross this barrier. In central New South Wales, small carbonate platforms, formed on a volcanic arc in the Middle and Late Ordovician, were populated exclusively by nektonic nautiloids, all except one genus of which have a wide distribution. However, the contemporaneous faunas of central New South Wales and Tasmania have only two genera in common, because of the different tectonic and environmental settings. In northern Australia, nautiloids are restricted to the Early and early Middle Ordovician. Early Ordovician faunas of the Georgina Basin, Tasmania, and the Mount Arrowsmith sequences have no species, and very few genera, in common with those of the Amadeus and Canning basins. This suggests that no sea link crossed Australia at this time. However, the strong similarity between faunas of the Amadeus and Canning basins suggests they were linked during the late Early Ordovician. The nautiloid faunas of Sibumasu (Siam, Burma, Malaysia, and Sumatra) were similar, in the Early Ordovician, to Canning Basin faunas. However, in the Middle Ordovician the faunas are similar to those of the Georgina Basin. That nautiloids similar to those found in Sibumasu and the Georgina Basin occur in the Stairway Sandstone of the Amadeus Basin supports the suggestion of a sea link across Australia in the early Middle Ordovician. This connection occurred after deposition of the Horn Valley Siltstone (late Ibexian-early Whiterockian)." @default.
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- W1565969832 date "2013-03-18" @default.
- W1565969832 modified "2023-09-25" @default.
- W1565969832 title "Biogeography of Australian and Southeast Asian Ordovician Nautiloids" @default.
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- W1565969832 doi "https://doi.org/10.1029/gm041p0021" @default.
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