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One of the principal biostratigraphical tools used in the lower Palaeozoic, and especially the Cambrian System, is trilobites. Historically, both polymerids and agnostoids have commonly been included as ‘trilobite’ groups, although currently the question of whether they comprise a monophyletic group or are polyphyletic is unsettled. Beginning in the late 1800s, the base of the Cambrian System was...
Three stratigraphic sections in the Cambrian of China that contain complete successions across important biohorizons having chronostratigraphic value, and that may be useful for developing Cambrian stage or series boundaries, are reviewed. The Wuliu section (Guizhou, South China), contains the FAD of Oryctocephalus indicus at 58.2 m above the base of the Kaili Formation. The Wangcun North section...
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