(Re)proposal of three Cambrian Subsystems and their Geochronology

Landing, Ed; Geyer, Gerd; Schmitz, Mark D.; Wotte, Thomas; Kouchinsky, Artem

doi:10.18814/epiiugs/2020/020088

Cited by 21 publications

(28 citation statements)

References 49 publications

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“…Unlike Landing et al (2020), I do not necessarily advocate the introduction of another (subsystem) level to the Cambrian chronostratigraphic hierarchy. However, it is possible that the ISCS may consider this possibility in the future.…”

Section: Alternative Subsystem Proposalmentioning

confidence: 96%

“…The proposal of Landing et al (2020) is for the adoption of a scale of three Cambrian subsystems, the lowest of which embraces the two lowest global series, whereas the remaining two coincide with the global Miaolingian and Furongian series. These are proposed to be named Lower Cambrian Subsystem, Middle Cambrian Subsystem and Upper Cambrian Subsystem (with their corresponding Subperiods).…”

Section: Subsystemsmentioning

confidence: 99%

“…This proposal follows from the introduction by Landing (1998, p. 2) of a Lower Cambrian Subsystem comprising his Avalonian Placentian and Branchian series. While Landing et al (2020) outline examples of putative unwitting introductions of subsystem-level units in the literature, that of Landing (1998) appears to be the first explicit proposal of a Cambrian subsystem.…”

Section: Subsystemsmentioning

confidence: 99%

“…Only the Carboniferous includes (two) recognised subsystems (e.g., Cohen et al, 2013;Gradstein et al, 2020). Landing et al (2020) interpret the continued use of lower/early, middle and upper/late divisions of the Cambrian, either informally (lowercase) or apparently formally (with initial capitals), to indicate that these tripartite units are convenient, useful and natural. They rightly deplore the continued use of the informal terms, as they are either undefined, illdefined or only regionally applicable, and their 'solution' to the problem is to formalise them as above.…”

Section: Alternative Subsystem Proposalmentioning

confidence: 99%

“…It is noteworthy that a four-series precedent had been set by Landing et al (1989) and Landing (1992), who recognised series respectively approximating to the traditional subtrilobitic Lower Cambrian, trilobitic Lower Cambrian, Middle Cambrian and Upper Cambrian on the Avalonia palaeocontinent (see, also Peng and Babcock, 2012). Landing et al (2020) provide an ample account of the historical development of the Cambrian chronostratigraphic scale.…”

Section: Introductionmentioning

confidence: 99%

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Proposal for a scale of Cambrian subsystems (if such is needed at all)

Kruse

2022

Episodes

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A recently proposed subsystem scale seeks to overlay a threefold subsystem scheme onto the four-series Cambrian. It does this by uniting the two lowest global series within a single subsystem, whereas the remaining two subsystems coincide with the global Miaolingian and Furongian series. This is an impractical scheme, strongly influenced by historical precedent, and an alternative scheme of two subsystems, each comprising two global series, is here proposed.

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Section: Alternative Subsystem Proposalmentioning

confidence: 96%

Section: Subsystemsmentioning

confidence: 99%

Section: Subsystemsmentioning

confidence: 99%

Section: Alternative Subsystem Proposalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Proposal for a scale of Cambrian subsystems (if such is needed at all)

Kruse

2022

Episodes

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Lophotrochozoa in the Cambrian evolutionary radiation and the Pelagiella problem

Landing

Geyer

Jirkov

et al. 2021

Papers in Palaeontology

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Tiny snail-like conchs of Pelagiella Matthew are important in discussions of lophotrochozoan and mollusc origins in the Cambrian evolutionary radiation (CER). The limited morphological features of Pelagiella conchs have led to the 'Pelagiella problem': (1) poorly distinguished Pelagiella species; (2) an exceptional genus range across all Cambrian palaeocontinents and climate belts; (3) an unparalleled genus-lifespan (c. 31 myr) in the early Palaeozoic; and (4)the assumption that all Pelagiella spp. are gastropods, which compromises lophotrochozoan and mollusc phylogenies. The type species P. atlantoides is a gastropod, but we show that so-called Pelagiella species with sub-to-triangular apertures and turbiniform conchs are not referable to the genus. Reevaluation of spectacular specimens of Pelagiella exigua Resser & Howell show it to be a polychaete with two apertural paleal chaetae fan arrays. Given that some modern sedentary polychaetes have paleal fan arrays, P. exigua is regarded as a likely member of the Sabellida Levinsen and is assigned to Pseudopelagiella gen. nov. Other Pelagiella spp. and forms with similar conchs are probably polychaetes not relevant to syntheses of early mollusc diversification. Pelagiellidae fam. nov. should be restricted to the late early Cambrian (c. 508 Ma) P. atlantoides. Pseudopelagiella exigua was unattached, probably benthic and lived with the apical conch surface on the sea floor, a mode of life similar to that of another family of the Sabellida, the sessile spirorbids that are cemented to substrate. Among numerous crown groups, the late early Cambrian eve of the CER included the polychaete Pseudopelagiella exigua and gastropod P. atlantoides.

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Oldest known West Gondwanan graptolite: Ovetograptus? sp. (lower Agdzian/lowest Wuliuan; basal Middle Cambrian) of the Franconian Forest, Germany, and review of pre-Furongian graptolithoids

Geyer

Landing

Meier³

et al. 2022

PalZ

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The occurrence of a likely graptolite in lowest Wuliuan strata of the Franconian Forest almost certainly records the oldest known graptolithoid hemichordate in West Gondwana and possibly the oldest graptolite presently known. The fossil is a delicate, erect, apparently unbranched rhabdosome with narrow thecae tentatively assigned to the poorly known genus Ovetograptus of the Dithecodendridae. This report includes an overview of pre-Furongian graptolithoids with slight corrections on the stratigraphic position of earlier reported species.

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(Re)proposal of three Cambrian Subsystems and their Geochronology

Cited by 21 publications

References 49 publications

Proposal for a scale of Cambrian subsystems (if such is needed at all)

Proposal for a scale of Cambrian subsystems (if such is needed at all)

Lophotrochozoa in the Cambrian evolutionary radiation and the Pelagiella problem

Oldest known West Gondwanan graptolite: Ovetograptus? sp. (lower Agdzian/lowest Wuliuan; basal Middle Cambrian) of the Franconian Forest, Germany, and review of pre-Furongian graptolithoids

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