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Volcanic-ash beds within fossiliferous strata of the southern Uralian foredeep of Russia have been dated by the high-precision ID-TIMS U–Pb zircon method, to constrain the age of the Carboniferous–Permian transition. The stratigraphic section exposed at the Usolka locality, an auxiliary stratotype for the Carboniferous–Permian boundary, contains a detailed multi-taxa biostratigraphy with a well-resolved...
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