Abstract
The boundary strata of Upper Ordovician, Silurian, and Lower Devonian marine carbonate sections in the European Northeast are usually correlated using a succession of brachiopod and conodont faunas. The regional Ordovician—Silurian, Llandoverian—Wenlockian, and Silurian—Devonian boundaries considered as important event levels accompanied by extinctions of different faunas are determined by evolutionary and ecological biotical changes that reflect local and global processes. The geochemical studies demonstrated the successful application of data to changes in the 5 1 C isotope composition in Paleozoic carbonate rocks for interbasin correlation. Recent studies yielded the С isotope markers for biostratigraphically dated intervals of the Upper Ordovician, Lower Silurian, and Lower Devonian sections of the western Urals [1,2].
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