Journal
LETHAIA
Volume 47, Issue 3, Pages 432-436Publisher
WILEY-BLACKWELL
DOI: 10.1111/let.12069
Keywords
Foliomena Fauna; Middle Ordovician; Miaopo Formation; Yichang; central China
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Funding
- National Natural Science Foundation of China [41221001, 41290260]
- State Key Laboratory of Palaeobiology and Stratigraphy
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The oldest Foliomena fauna was, until now, known from the middle-upper Miaopo Formation (Nemagraptus gracilis Biozone, lower Sandbian, basal Upper Ordovician) of South China. In this study, the oldest record of the fauna is set back to the latest Darriwilian (upper Hustedograptus teretiusculus Biozone), represented by Foliomena jielingensis and some typical constituents of the Foliomena fauna from the basal Miaopo Formation at Jieling, northern Yichang, western Hubei Province, central China. The Miaopo Formation is characterized by its organic-rich dark-grey shale facies, unique in its localized distribution on the Yangtze Platform, and distinguished by its rich and diverse benthic and graptolitic faunas. This suggests an origin of the Foliomena fauna in periodically oxygen-starved local depressions on the Yangtze Platform during the Middle-Late Ordovician transition.
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