New taxa and revised stratigraphic distribution of the crinoid fauna from Anticosti Island, Québec, Canada (Late Ordovician-early Silurian)

Ausich, William I.; Cournoyer, Mario

doi:10.1017/jpa.2019.36

Cited by 6 publications

(6 citation statements)

References 54 publications

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“…This genus is known from at least three Hirnantian localities in Wales (Donovan and Veltkamp, 1993). Ausich and Cournoyer (2019) confirmed the presence of Xenocrinus, also across the Ordovician-Silurian boundary, based on occurrences of isolated columnals and complete specimens of the species X. rubus Ausich and Copper, 2010 in Rhuddanian rocks of the Becsie Formation, Anticosti. The occurrence of columnals of Xenocrinus in the Tihange Formation associated with Rhuddanian graptolites suggests this genus also occurs in the Silurian of Europe (see Age of the Tihange Member fossil associations section for further information).…”

Section: Phylummentioning

confidence: 58%

HirnantiaFauna from the Condroz Inlier, Belgium: another case of a relict Ordovician shelly fauna in the Silurian?

et al. 2021

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The end-Ordovician mass extinction, linked to a major glaciation, led to deep changes in Hirnantian–Rhuddanian biotas. The Hirnantia Fauna, the first of two Hirnantian survival brachiopod-dominated communities, characterizes the lower–mid Hirnantian deposits globally, and its distribution is essential to understand how the extinction took place. In this paper, we describe, illustrate, and discuss the first macrofossiliferous Hirnantia Fauna assemblage from Belgium, occurring in the Tihange Member of the Fosses Formation at Tihange (Huy), within the Central Condroz Inlier. Six fossiliferous beds have yielded a low-diversity, brachiopod-dominated association. In addition to the brachiopods (Eostropheodonta hirnantensis, Plectothyrella crassicosta, Hirnantia sp., and Trucizetina? sp.), one trilobite (Mucronaspis sp.), four pelmatozoans (Xenocrinus sp., Cyclocharax [col.] paucicrenulatus, Conspectocrinus [col.] celticus, and Pentagonocyclicus [col.] sp.), three graptolites (Cystograptus ancestralis, Normalograptus normalis, and ?Metabolograptus sp.), together with indeterminate machaeridians and bryozoans were identified. The graptolite assemblage, from the Akidograptus ascensus-Parakidograptus acuminatus Biozone, indicates an early Rhuddanian (Silurian) age, and thus, an unexpectedly late occurrence of a typical Hirnantia Fauna. This Belgian association may represent an additional example of relict Hirnantia Fauna in the Silurian, sharing characteristics with the only other known from Rhuddanian rocks at Yewdale Beck (Lake District, England), although reworking has not been completely ruled out. The survival of these Hirnantian taxa into the Silurian might be linked to delayed post-glacial effects of rising temperature and sea-level, which may have favored the establishment of refugia in these two particular regions that were paleogeographically close during the Late Ordovician–early Silurian.

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Section: Phylummentioning

confidence: 58%

HirnantiaFauna from the Condroz Inlier, Belgium: another case of a relict Ordovician shelly fauna in the Silurian?

et al. 2021

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“…In addition, Broadhead and Ettensohn (1981), Ausich and Dravage (1988), Blake and Ettensohn (2009), Boyarko and Ausich (2009), and Ausich et al (2015) described additional crinoids and asteroids from the Brassfield Formation elsewhere in Ohio and Kentucky. Oakes Quarry Park has one of the richest Llandovery echinoderm faunas known, with other important faunas (with 10 or more taxa) from the Cabot Head Formation (Rhuddanian), New York and Ontario (Brett, 1978; Eckert 1984); Farmer's Creek Member, Hopkinton Formation (Aeronian), Iowa (Witzke and Strimple, 1981); Leijiatum Formation (Aeronian), China (Mao et al, 2017); Chicotte Formation, Cybele Member of the Jupiter Formation, and Ferrum Member of the Jupiter Formation (Telychian), Québec (Ausich and Copper, 2010; Ausich and Cournoyer, 2019); Osgood Formation (Telychian to Wenlock), Indiana (Frest et al, 1999); the Welton Member of the Scotch Grove Formation (Telychian–Wenlock), Iowa; Wolcott Limestone (Telychian), New York (Eckert and Brett, 2001); and the lower Visby Formation (Telychian), Sweden (Angelin, 1878). Of these diverse Llandovery echinoderm faunas, only the Cybele Member of the Jupiter Formation and now the Brassfield Formation have reported cyclocystoids with complete marginal rings.…”

Section: Llandovery Echinoderm Faunasmentioning

confidence: 99%

Recovery of Laurentian cyclocystoids following Late Ordovician extinctions (Brassfield Formation, Llandovery; southwestern Ohio)

Ausich

Zehler²

2022

J. Paleontol.

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Zygocycloides? foerstei n. sp. is described from the Llandovery (Aeronian) Brassfield Formation of southwestern Ohio. This is among the oldest reported Silurian cyclocystoids from North America and is the only North American Llandovery cyclocystoid that is preserved with a complete rim of marginal ossicles. Zygocycloides Smith and Paul, 1982 is most similar to Nicholsodiscus Glass et al., 2003 (Katian) and Perforocycloides Ewin et al., 2019 (Llandovery, Telychian), both from Anticosti Island, Québec. Cyclocystoids (Ordovician to Mississippian) survived Late Ordovician extinctions, and this discovery documents that this echinoderm clade was part of shallow-water, marine paleocommunities during the initial post-extinction transgression onto the Laurentian platform. UUID: http://zoobank.org/3d3e092e-267b-4841-9245-6275d1eb79a1

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“…granditubus (Ramsbottom, 1961); P . martini Ausich and Cournoyer, 2019; P . observationensis Ausich and Copper, 2010; P .…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…observationensis Ausich and Copper, 2010; P . petryki Ausich and Cournoyer, 2019; P . proboscidiatus (Billings, 1857); P .…”

Section: Systematic Paleontologymentioning

confidence: 99%

Biodiversity, systematics, and new taxa of cladid crinoids from the Ordovician Brechin Lagerstätte

2019

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Upper Ordovician (Katian) strata of the Lake Simcoe region of Ontario record a spectacularly diverse and abundant echinoderm fauna known as the Brechin Lagerstätte. Despite recognition as the most taxonomically diverse Katian crinoid paleocommunity, the Brechin Lagerstätte has received relatively little taxonomic study since Frank Springer published his classic monograph on the “Kirkfield fauna” in 1911.Using a new collection of exceptionally preserved material, we evaluate all dicyclic inadunate crinoids occurring in the Brechin Lagerstätte, which is predominantly comprised of cladids (Eucladida and Flexibilia). We document 15 species across 11 genera, including descriptions of two new genera and four new species. New taxa include Konieckicrinus brechinensis n. gen. n. sp., K. josephi n. gen. n. sp., Simcoecrinus mahalaki n. gen. n. sp., and Dendrocrinus simcoensis n. sp.Although cladids are not commonly considered major components of the Early Paleozoic Crinoid Macroevolutionary Fauna, which is traditionally conceived as dominated by disparids and diplobathrid camerates, they are the most diverse major lineage of crinoids occurring in the Brechin Lagerstätte. This unexpected result highlights the important roles of specimen-based taxonomy and systematic revisions in the study of large-scale diversity patterns.UUID: http://zoobank.org/09dda7c2-f2c5-4411-93be-3587ab1652ab

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New taxa and revised stratigraphic distribution of the crinoid fauna from Anticosti Island, Québec, Canada (Late Ordovician-early Silurian)

Cited by 6 publications

References 54 publications

HirnantiaFauna from the Condroz Inlier, Belgium: another case of a relict Ordovician shelly fauna in the Silurian?

HirnantiaFauna from the Condroz Inlier, Belgium: another case of a relict Ordovician shelly fauna in the Silurian?

Recovery of Laurentian cyclocystoids following Late Ordovician extinctions (Brassfield Formation, Llandovery; southwestern Ohio)

Biodiversity, systematics, and new taxa of cladid crinoids from the Ordovician Brechin Lagerstätte

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