Chemostratigraphic correlations across the first major trilobite extinction and faunal turnovers between Laurentia and South China.

Sci Rep · 2019 · PMC6874646 · PMID 31758094

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a decreasing trendno p-value reported

A decreasing trend from −6.1‰ to −9.9‰ is present from the uppermost Tsinghsutung Formation to the B. kueichouensis-O. sinensis / O. indicus boundary.

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an increasing trendno p-value reported

In the South China data represented by the Wuliu-Zengjiayan section, δ 13 C org values show an increasing trend from −32.0‰ to −24.5‰ from the basal Kaili Formation to the B. kueichouensis-O. sinensis / O. indicus boundary.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.