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The uppermost Middle to lowermost Upper Ordovician succession of interbedded radiolarian chert and shales exposed at Seal Creek in southeastern Australia contains a diverse, abundant, and well-preserved trace-fossil assemblage that inhabited pelagic, deep-oceanic sediments on an abandoned section of a submarine fan complex. Trace fossils occur throughout the measured section, but the types and abundance of the trace fossils vary from horizon to horizon. Planolites and Palaeophycus are common in all chert beds, while Zoophycos, Alcyonidiopsis, Compaginatichnus-like, and Teichichnus-like trace fossils are limited to the upper part of the succession. Shales interbedded with the cherts have a much less...

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