NORTH AMERICAN COMMISSION ON STRATIGRAPHIC NOMENCLATURE Note 71 - Application for addition of chemostratigraphic units to the North American Stratigraphic Code: Acase for formalizing chemostratigraphic units

Scott, Robert W.; Brett, Carlton E.; Fluegeman, Richard H.; Pratt, Brian R.

doi:10.29041/strat.17.2.135-139

Cited by 6 publications

(5 citation statements)

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“…It should be noted that no consistent distinction exists between chemostratigraphic 'events' and 'excursions',, with many 'events' (e.g. GICE, OAB 1-3) having long durations (Scott et al 2020).…”

Section: Utility Of Herb Eventmentioning

confidence: 99%

“…Thus, only TOCE homonym 4 is a synonym (albeit junior) of HERB. Zhu et al (2020) argue that HERB is not legitimate as the acronym was not explained when proposed, although named chemostratigraphic events, if acronyms, are often not explained (Scott et al 2020). Zhu et al (2020) thus assert a well-defined acronym has priority over the detailed biostratigraphy of the HERB Event in the same volume where TOCE was proposed based on data from the literature (Miller et al 2006, p. 400, fig.…”

Section: Utility Of Herb Eventmentioning

confidence: 99%

“…Zhu et al (2020) noted HERB was not named in a formal publication (i.e. Ripperdan, 2002) as required by the North American Commission on Stratigraphic Nomenclature (2005), although no recommendations existed for chemostratigraphic unit names until recently (Scott et al 2020). TOCE's changing biostratigraphic position is shown in reports since 2006 (Fig.…”

Section: Utility Of Herb Eventmentioning

confidence: 99%

“…Chemostratigraphic units require documentation of geochemical changes through a lithosequence, consistent ranges shown by independent markers (bio-, magnetostratigraphic, etc.) and reference sections (Scott et al 2020). Use of a chronostratigraphic unit must be consistent with its original concept and not replace a pre-existing unit as a synonym (Scott et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…and reference sections (Scott et al 2020). Use of a chronostratigraphic unit must be consistent with its original concept and not replace a pre-existing unit as a synonym (Scott et al 2020). These considerations emphasize HERB's utility as an Upper Cambrian correlation tool.…”

Section: Introductionmentioning

confidence: 99%

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Discussion of ‘Reply to “Uppermost Cambrian carbon chemostratigraphy: the HERB and undocumented TOCE events are not synonymous”’

2021

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No basis for controversy exists in the naming of a global, strongly negative, uppermost Cambrian carbon isotope (δ13C) excursion. The HERB Event (HERB) has met the standards for chemostratigraphic units (i.e. consistent biostratigraphic brackets, content and concept) since 1992. By comparison, the TOCE excursion morphed through four temporally distinct δ13C events with spike-like nadirs that shifted temporally through the uppermost Cambrian until its synonymization with HERB (2006–12). In 2018, TOCE became a prolonged interval with very early onset and enveloped HERB – meaning five TOCE homonyms have been unambiguously defined and figured. HERB lies in the high-diversity ptychaspid biomere (trilobites) and below the ptychaspid extinction. But, data on it were used in TOCE’s 2006 proposal and in later iterations (2008, 2012) to show it (1) higher, both at and above the ptychaspid extinction; (2) at the level of HERB (2012, 2018); and (3) even extending well below HERB (2018). TOCE fails the recommendations for a formal chemostratigraphic unit. Its relationship to latest Cambrian biotic turnover includes equation with extinction and high-diversity intervals. One TOCE homonym is a synonym, albeit junior, of HERB.

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Section: Utility Of Herb Eventmentioning

confidence: 99%