01349nas a2200145   4500008004100000022001400041245010600055210006900161300001000230520081200240100001601052700002601068700001601094856009301110       2020                        eng d  a0016-756800aUppermost Cambrian carbon chemostratigraphy: the HERB and undocumented TOCE events are not synonymous0 aUppermost Cambrian carbon chemostratigraphy the HERB and undocum  a1 - 53 a<p>Chemostratigraphic units require consistent definitions and unambiguous names. So-called TOCE (Top of Cambrian Excursion) is used as an uppermost Cambrian δ13Ccarb negative excursion although it was proposed without documentation, is ambiguously defined, and variably correlated into four Laurentian trilobite zones. TOCE, a nihilartikel, is regularly substituted to the exclusion of the earlier named, precisely documented and geochronologically older HERB (Hellnmaria-Red Tops Boundary) Event. HERB allows late Cambrian global correlation; its onset is close to the lowest occurrence of the conodont Eoconodontus notchpeakensis at the base of a proposed replacement (Lawsonian Stage) of Cambrian Stage 10. TOCE must be retired from use and abandoned as a synonym of the HERB Event.<br />
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1 aLanding, E.1 aRipperdan, Robert, L.1 aGeyer, Gerd  uhttps://www.cambridge.org/core/product/identifier/S0016756820000382/type/journal_article