The IUGS boundary in the middle of the Carboniferous: Arrow Canyon, Nevada, USA

Lane, H. Richard; Brenckle, Paul L.; Baesemann, John F.; Richards, B C

doi:10.18814/epiiugs/1999/v22i4/003

Cited by 81 publications

(49 citation statements)

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“…Disagreement surrounding the Mississippian–Pennsylvanian (Mid‐Carboniferous) boundary provides a good example. This is defined at the First Appearance Datum of the conodont Declinognathodus noduliferus at the Global Stratotype Section and Point (GSSP) at Arrow Canyon, Nevada, USA (Lane et al. 1999), and is supported by an explicit phylogenetic hypothesis that D. noduliferus evolved from Gnathodus girtyi simplex .…”

Section: Discussionmentioning

confidence: 98%

Cladistic tests of monophyly and relationships of biostratigraphically significant conodonts using multielement skeletal data –Lochriea homopunctatus and the genus Lochriea

Atakul‐Özdemir

Purnell

Riley³

2012

Palaeontology

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Since the 1960s, huge progress has been made in reconstructing the multielement skeletons of conodont species and developing a biologically defensible taxonomy. Nevertheless, a widespread prejudice remains that certain parts of the conodont skeleton, particularly the P1 elements, are more informative than others with regard to taxonomy and evolutionary relationships. Here, we test these views. A new partial multielement reconstruction of the skeleton of the biostratigraphically significant conodont originally described as Gnathodus commutatus homopunctatus allows us to conduct a cladistic test of the alternative hypotheses of phylogenetic placement of this species. Our analysis also provides the first test of the hypothesis that Lochriea– species of which are markers for global correlation – is monophyletic and tests hypotheses concerning the origins of the genus. Our results demonstrate that homopunctatus is a species of Lochriea and that the genus is monophyletic. The widely held view that Lochriea arose from a species of Bispathodus is not supported. Our results show that it is difficult to predict a priori which parts of the conodont skeleton carry phylogenetic signal, and provide strong support for the hypothesis that similarity in the morphology of conodont P1 elements alone is not a reliable guide to relationships and taxonomic groupings of conodont species. This is because P1 elements with similar morphologies are convergently acquired in multiple conodont clades, because reliance on the characters of only one of the six or seven morphologically distinct elements of the conodont skeleton ignores phylogenetically significant data and because P1 elements can lack characters that might seem to be diagnostic of a genus. Conodonts are no different to other organisms: ignoring data that have the potential to be phylogenetically informative is unlikely to produce the most reliable hypotheses of evolutionary relationships. We suggest that other biostratigraphically significant hypotheses of relationship between conodont taxa that are based on P1 elements alone should be subject to cladistic testing.

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Section: Discussionmentioning

confidence: 98%

Cladistic tests of monophyly and relationships of biostratigraphically significant conodonts using multielement skeletal data –Lochriea homopunctatus and the genus Lochriea

Atakul‐Özdemir

Purnell

Riley³

2012

Palaeontology

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“…If the Viséan-Serpukhovian ages indicated by the foraminifera, corals, and brachiopods are upheld, D. noduliferus could not be used at least in this part of the Sahara as marker for the Pennsylvanian. This is in contradiction to the present GSSP concept for this limit (Lane et al 1999), and thus strongly questions its global approach.…”

Section: Three Possible Scenarios and Global Correlationmentioning

confidence: 57%

“…Conodont data Wendt et al (2009) found the conodont Declinognathodus noduliferus, the faunal marker for the Mid-Carboniferous boundary (Lane et al 1999) in the basal beds and upper part of the Calcaires du Jebel Berga in the Hassi Taibine section and 100 m above the formation base in the Tirechchoumine section. Hence, Wendt et al (2009) concluded a Bashkirian age for the entire formation based on these three samples.…”

Section: Stratigraphymentioning

confidence: 99%

Discussion of “Carboniferous stratigraphy and depositional environments in the Ahnet Mouydir area (Algerian Sahara)” by Wendt et al. (Facies 55(3):443–472, DOI 10.1007/s10347-008-0176-y)

Legrand-Blain¹,

Aretz

Atif

2010

Facies

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“…The fact that D. noduliferus s.l. occurs abundantly in the entire paleoequatorial belt and appears at approximately the same stratigraphic level, has been the main reason why the evolutionary appearance of this species has been selected for the recognition of the base of the Pennsylvanian and the coincident base of the Bashkirian stage (Lane et al 1999). Several studies (for review see Menning et al 2006) have shown that ammonoids and foraminifers can only locally be useful markers to approximate the Mid-Carboniferous boundary.…”

Section: Stratigraphic Signiwcance Of the Conodont Declinognathodus Nmentioning

confidence: 99%

Carboniferous stratigraphy and depositional environments in the Ahnet Mouydir area (Algerian Sahara): reply to the discussion by Legrand-Blain et al. (DOI: 10.1007/s10347-010-0214-4)

Wendt

Kaufmann

Bełka

et al. 2010

Facies

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The IUGS boundary in the middle of the Carboniferous: Arrow Canyon, Nevada, USA

Cited by 81 publications

References 0 publications

Cladistic tests of monophyly and relationships of biostratigraphically significant conodonts using multielement skeletal data –Lochriea homopunctatus and the genus Lochriea

Cladistic tests of monophyly and relationships of biostratigraphically significant conodonts using multielement skeletal data –Lochriea homopunctatus and the genus Lochriea

Discussion of “Carboniferous stratigraphy and depositional environments in the Ahnet Mouydir area (Algerian Sahara)” by Wendt et al. (Facies 55(3):443–472, DOI 10.1007/s10347-008-0176-y)

Carboniferous stratigraphy and depositional environments in the Ahnet Mouydir area (Algerian Sahara): reply to the discussion by Legrand-Blain et al. (DOI: 10.1007/s10347-010-0214-4)

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