Silurian spores and cryptospores from the arisaig group, Nova Scotia, Canada

Beck, John H.; Strother, Paul K.

doi:10.1080/01916122.2001.9989558

Cited by 9 publications

(21 citation statements)

References 32 publications

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“…Beck & Strother (2001) described a miospore assemblage from Nova Scotia (western Avalonia) from the Arisaig Group. The sediments comprise silisiclastic mudstone and siltstone deposits and represent an almost complete succession of Silurian strata.…”

Section: Comparison With Other Assemblagesmentioning

confidence: 99%

A palynological study from Sweden reveals stable terrestrial environments during Late Silurian extreme marine conditions

Mehlqvist¹,

Wigforss-Lange²,

Vajda³

2014

Earth and Environmental Science Transactions of the Royal Socie

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A palynological study of the upper Silurian Ö ved-Ramsåsa Group in Skåne, Sweden yields a well preserved spore assemblage with low relative abundances of marine microfossils. In total, 26 spore taxa represented by 15 genera were identified. The spore assemblage is dominated by long-ranging cryptospore taxa, and the trilete spore Ambitisporites avitus-dilutus. However, key-species identified include Artemopyra radiata, Hispanaediscus lamontii, H. major, H. verrucatus, Scylaspora scripta and Synorisporites cf. libycus. Importantly, Scylaspora klintaensis was identified, allowing correlation with the Klinta 1 drillcore (Skåne). A Ludlow age is inferred for the exposed succession, which agrees well with previous conodont stratigraphy. The organic residue is dominated by phytodebris and spores, but with high relative abundances of acritarchs at two levels, possibly related to flooding surfaces.Based on the palynofacies analysis, a near-shore marine environment is proposed. The close proximity to land is inferred by the high proportions of spores, and the dispersed assemblage most likely represents the local flora growing on delta plains. The palynological signal also infers a stable terrestrial environment and vegetation, in contrast to unstable conditions in the marine environment characterised by ooid formation in an evaporitic environment. Comparisons with coeval spore assemblages from Gotland, Avalonia and Laurentia show relatively close similarities in taxonomic composition at the generic level.

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Section: Comparison With Other Assemblagesmentioning

confidence: 99%

A palynological study from Sweden reveals stable terrestrial environments during Late Silurian extreme marine conditions

Mehlqvist¹,

Wigforss-Lange²,

Vajda³

2014

Earth and Environmental Science Transactions of the Royal Socie

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“…The systematic basis for the study of Silurian cryptospores and trilete spores was established by Burgess (1991) for the type Llandovery area, Burgess and Richardson (1991) for the type Wenlock area, and Burgess and Richardson (1995) for late Wenlock to early Pfídolí sections in Great Britain. These papers provide a record of cryptospore and trilete spore distribution through the same interval as now seen in western Avalon (Beck and Strother, 2001) and in the Allenport section. Hagstrom (1997) described a sequence of Wenlock-Ludlow cryptospores and trilete spores from Gotland in Sweden.…”

Section: Introductionmentioning

confidence: 77%

“…Material examined.-One specimen at Allenport (bsk97-54), and two specimens from the middle Stonehouse Formation, Arisaig, Nova Scotia (Beck and Strother, 2001).…”

Section: Synorisporites? Sp Cf Synorisporites Verrucatusmentioning

confidence: 99%

Miospores and cryptospores from the Silurian section at Allenport, Pennsylvania, USA

Beck

Strother

2008

J. Paleontol.

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Non-marine and marine palynomorphs were collected from a Telychian through Gorstian rock outcrop located near Allenport, Pennsylvania, USA in the east-central part of the Appalachian Foreland Basin. Close sampling of the section revealed six distinct palynological assemblages of spores, cryptospores, acritarchs and prasinophycean algae, likely deposited in nearshore marine settings. The Silurian Period is a critical time in plant evolution as megafossils found elsewhere indicate that vascular plants (tracheophytes) originated during this interval. Palynoflorules generally show a transition from cryptospore-dominated to miospore-dominated assemblages during the latter half of the Silurian. This transition is evident at Allenport, where over 30 species of miospores and cryptospores are recognized, including two new species: Vermiverruspora cottera and Rugosphaera falloambita. The sequential progression of innovations in exine structure and sculpture seen in the nonmarine palynomorphs at Allenport closely matches evolutionary patterns documented previously in the Appalachian Basin, Avalonia, and elsewhere around the world.

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“…It is noteworthy that the organic microfossils do not exclude even an early Gorstian (Ludlow) age for the upper part of section No. 760 (see Burgess & Richardson 1991, 1995Beck & Strother 2001, 2008Steemans et al 2012). …”

Section: Kozel Limestone Membermentioning

confidence: 99%

First evidence for the Homerian (late Wenlock, Silurian) positive carbon isotope excursion from peri-Gondwana: new data from the Barrandian (Perunica)

Frýda¹,

Frýdová²

2014

Bull. Geosci.

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The Homerian (late Wenlock, Silurian) carbon isotope excursion is documented for the first time from peri-Gondwana based on new data from the Barrandian (Perunica). It is also the first time that this excursion has been found outside of the palaeoplates that subsequently formed the supercontinent Laurussia (i.e., Laurentia, Baltica and Avalonia). The typical two-peaked Homerian δ 13 C excursion is documented from a highly fossiliferous shallow-water limestone succession formally established here as the Kozel Limestone Member of the Motol Formation. Application of δ 13 C chemostratigraphy considerably improves the stratigraphic resolution within the Kozel Limestone Member and enables more precise dating of its very diverse fauna. The present data reveal recovery of benthic communities after a series of mid-Homerian extinction events (i.e., the Mulde conodont and the end lundgreni graptolite bioevents) started much earlier than has been hitherto described from other world occurrences.•

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Silurian spores and cryptospores from the arisaig group, Nova Scotia, Canada

Cited by 9 publications

References 32 publications

A palynological study from Sweden reveals stable terrestrial environments during Late Silurian extreme marine conditions

A palynological study from Sweden reveals stable terrestrial environments during Late Silurian extreme marine conditions

Miospores and cryptospores from the Silurian section at Allenport, Pennsylvania, USA

First evidence for the Homerian (late Wenlock, Silurian) positive carbon isotope excursion from peri-Gondwana: new data from the Barrandian (Perunica)

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