First report of Ordovician (Caradoc–Ashgill) palynomorphs from Orphan Knoll, Labrador Sea

Legault, J. A.

doi:10.1139/e82-163

Cited by 20 publications

(7 citation statements)

References 7 publications

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“…Legault (1982) has indicated that similar assemblages occur in the Labrador Sea and on Baffin Island. None of the Avalonian/Gondwanan of Laurentian genera are known from Baltica, where middle Ordovician (Viruan) assemblages from Sweden (Kjellstrom, 1976, and references therein;Gorka, 1987) are dominated by more cosmopolitan genera including Baltisphaeridium, Goniosphaeridium, Multiplicisphaeridium, Orthosphaeridium and Peteinosphaeridium.…”

Section: Recycled Acritarchs As Provenance Indicatorsmentioning

confidence: 94%

Recycled acritarchs as provenance indicators: implications for Caledonian terrane reconstruction

et al. 1992

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Silurian successions deposited on the margins of the Iapetus Ocean in the English Lake District, Southern Uplands of Scotland and Ireland contain recycled Ordovician acritarchs. These include taxa known only from Avalonia and Gondwana, with other recycled acritarchs possibly derived from Baltica. There is no palynological evidence to indicate that Laurentia constituted a source area. The data presented herein suggest that provinciality in derived microfossils may be profitably exploited in provenance studies.

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Section: Recycled Acritarchs As Provenance Indicatorsmentioning

confidence: 94%

Recycled acritarchs as provenance indicators: implications for Caledonian terrane reconstruction

et al. 1992

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“…Upper Ordovician of North America; Indiana (Dillsboro Fm. ; Loeblich, 1970a); Kentucky (Jacobson, 1978); Labrador Sea (Legault, 1982); Missouri (Maquoketa Shale; Miller, 1991). Middle Ordovician of Estonia (Uutela and Tynni, 1991).…”

Section: Systematic Paleontologymentioning

confidence: 99%

Palynology of the Ordovician Kanosh Shale at Fossil Mountain, Utah

Vecoli¹,

Beck²,

Strother³

2015

J. Paleontol.

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Palynomorph assemblages recovered from the Kanosh Shale at Fossil Mountain, Utah, are dominated by operculate acritarchs and cryptospores with minor smaller acritarchs. The present findings add new data to the largely incomplete knowledge of Ordovician acritarch assemblages from Laurentia, up to now known only from very few localities in North America. These populations contain some species in common with acritarchs from the Canning and Georgina basins in Australia and with assemblages from China; they indicate a Middle Ordovician (Dapingian-Darriwilian) age. The assemblage is lacking many typical marine acritarchs of this age, which, in combination with some cryptospores, is probably reflecting the likelihood of freshwater influence in the Kanosh Basin. This observation is congruent with previous interpretations of the depositional setting of the Kanosh Shale as a shallow water lagoon that supported the deposition of carbonate hardgrounds.Four new taxa are described: Busphaeridium vermiculatum n. gen., n. sp.; Digitoglomus minutum n. gen., n. sp.; Turpisphaera heteromorpha n. gen., n. sp.; and Vermimarginata barbata n. gen., n. sp. In addition, the abundance of operculate forms has enabled the revision and a new emendation of the genus Dicommopalla and clarification of the “opalla” complex. We also propose new and revised suprageneric taxa that emphasize inferred biological differences among acritarch genera. The Sphaeromorphitae subgroup is emended to include forms lacking sculptural elements. Two new informal subgroups are proposed: the Superornamenti and the Operculate Acritarchs. Cryptospores are abundant throughout the sections studied and they appear to be more closely related to the late Cambrian Agamachates Taylor and Strother than to Darriwilian and younger Ordovician cryptospores from Gondwana.

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“…(5) Orphan Knoll, offshore Canada (Legault, 1982). (6) Ouaouglout Member, Lower Ktaoua Formation, Morocco (Deunff in Destombes, Hollard & Willefert, 1985, p. 197).…”

Section: Correspondence and Notesmentioning

confidence: 99%

Micropalaeontological evidence for the age of the Borrowdale Volcanic Group

Molyneux

1988

Geol. Mag.

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First report of Ordovician (Caradoc–Ashgill) palynomorphs from Orphan Knoll, Labrador Sea

Abstract: Acritarchs and chitinozoans of Late Ordovician age have been recovered from probable bedrock on Orphan Knoll.

Cited by 20 publications

References 7 publications

Recycled acritarchs as provenance indicators: implications for Caledonian terrane reconstruction

Recycled acritarchs as provenance indicators: implications for Caledonian terrane reconstruction

Palynology of the Ordovician Kanosh Shale at Fossil Mountain, Utah

Micropalaeontological evidence for the age of the Borrowdale Volcanic Group

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