Foraminifers in upper Viséan–lower Serpukhovian limestones (Mississippian) from South Wales: regional correlation and implications for British foraminiferal zonal schemes

Cózar, Pedro; Somerville, Ian D.

doi:10.1144/pygs2020-009

Cited by 9 publications

(17 citation statements)

References 70 publications

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“…At the base of the Cf6δ subzone are H. bradyana , Asteroarchaediscus and Claracrusta catenoides . The occurrence of Asteroarchaediscus in older levels in Ireland and Wales compared with sections in England has been discussed by Cózar & Somerville (2020), whereas the forms included here as Neoarchaediscus ? sp.…”

Section: Correlation With European Zonal Schemesmentioning

confidence: 99%

“…This observation is incorrect because there are numerous sections where these foraminifers occur in the Cf6γ subzone or even in the Cf6δ subzone (e.g. Gallagher & Somerville 1997; Cózar & Somerville 2004, 2005 a , 2020; Somerville & Cózar 2005; Gallagher et al . 2006).…”

Section: Stratigraphy Of Trowbarrow Quarrymentioning

confidence: 99%

“…2011 a , 2021; Davies et al . 2014; Cózar & Somerville 2020). Furthermore, in Britain the early Asbian has often been characterized by ‘Holkerian foraminifers and rugose corals’ in Ravenstonedale (north‐east Cumbria), north Cumbria, Askrigg (Yorkshire) and North Wales (e.g.…”

Section: Figmentioning

confidence: 99%

“…Serious implications for the chronostratigraphic assignments in the British Visean lithostratigraphy arise from this, and correlation between distinct formations has to be reconsidered, even for those recently published (e.g. Cózar & Somerville 2020; Waters et al . 2021).…”

Section: Implication For the Early Asbian In Britain And Irelandmentioning

confidence: 99%

“…This assemblage contains the medium‐sized Cribrospira and Bibradya . Although B. inflata was described as a marker for the Asbian (Strank 1983), Cózar & Somerville (2020) revised the localities and assemblages where the species was mentioned in Britain and Ireland. They concluded that only some specimens of B. inflata and B .…”

Section: Biozonation and Analysismentioning

confidence: 99%

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A late Asbian (Mississippian) stratotype for England: Trowbarrow Quarry, Cumbria, UK

Cózar

Somerville

Hounslow

et al. 2022

Papers in Palaeontology

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A detailed biostratigraphy is established, using the high foraminiferal abundance and diversity at Trowbarrow Quarry, which is also proposed as a stratotype section for the late Asbian (late Visean), a substage not previously formally subdivided. The foraminiferal assemblages suggest that the early Asbian has to be revised, which has implications for the chronostratigraphy of many late Visean outcrops in Britain, which are probably erroneously interpreted. From the upper part of the Park Limestone Formation at Trowbarrow Quarry, near the base of the section, the transition between foraminifers assigned to the early and late Asbian (Cf6α–β to Cf6γ subzones) is identified. The Urswick Limestone Formation contains excellent biostratigraphic records of many important taxa, enabling the subdivision of the formation into five foraminiferal assemblage zones for the late Asbian, namely Cf6γ1a, Cf6γ1b, Cf6γ2a, Cf6γ2b and Cf6γ2c. The last assemblage is currently recognized only in the North Pennines and at Trowbarrow. These assemblages enable revision of the stratigraphic range of many taxa used as biostratigraphic markers in Britain and Ireland. Owing to its excellent foraminiferal record, the late Asbian subdivisions will significantly facilitate the reinterpretation of other well‐known Asbian platform carbonate successions in Britain. Although there are some faunal differences, the base of the late Asbian can be confidently correlated to other European zonal schemes, with its base being equivalent to the base of the former V3bγ or more recent MFZ14 foraminiferal zones of Belgium, and the base of the Mikhailovian Substage in Russia.

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Section: Correlation With European Zonal Schemesmentioning

confidence: 99%

Section: Stratigraphy Of Trowbarrow Quarrymentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Section: Implication For the Early Asbian In Britain And Irelandmentioning

confidence: 99%

Section: Biozonation and Analysismentioning

confidence: 99%

See 3 more Smart Citations

A late Asbian (Mississippian) stratotype for England: Trowbarrow Quarry, Cumbria, UK

Cózar

Somerville

Hounslow

et al. 2022

Papers in Palaeontology

Self Cite

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Maiaspora: the hallmark of gleichenioid ferns (Gleicheniales) from the early Carboniferous

Mamontov,

McLean,

Gavrilova

2024

Papers in Palaeontology

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The Palaeozoic origin of gleichenioid ferns (Gleicheniales) has aroused curiosity for almost a century. The oldest definite sign of this ancient clade is the spore wall ultrastructure of Radiitheca dobranyana from the Moscovian of central Europe. However, familial assignment of this fern fossil is uncertain. A comparison of its in situ spores with those of the dispersed genus Maiaspora, from the Visean, suggests that they may represent the same group of leptosporangiates. Although these spores have a common metareticuloid sculpture, the ultra‐thin structure of the dispersed counterparts remained unknown. Study of the ultrastructure of Maiaspora concava and M. panopta from central Russia and Northumberland (UK) using transmission electron microscopy shows that the wall of Maiaspora has a middle exospore layer composed of foliated lamellae. These spread from the base of the aperture slit to the subequatorial margins of kyrtome areas. The lamellae do not overlap the aperture slit and terminate at between two‐thirds and three‐quarters of the slit height. The miospores have a three‐layered exospore in the interradial areas, while non‐apertural parts of the exospore consist of two layers. Such an ultrastructure is shared by extant Gleicheniales and fossil R. dobranyana. The combined evidence from the morphology, ultrastructure and spatiotemporal distribution of Maiaspora, as well as radioisotope dating and additional plant macrofossils, suggests that the origin of the Gleicheniales stem was related to closure of the Rheic Ocean. Apparently, the first Maiaspora‐producing gleichenioids emerged as neoendemic terrestrial ferns on the peri‐Gondwanan volcanic arcs.

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Revisiting the upper Visean mud mounds from Derbyshire (UK): the role of brachiopods in their growth

Carniti

Porta

Banks

et al. 2023

Facies

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Several brachiopod-rich mud mounds occur in the upper Visean (Brigantian) of the Derbyshire Carbonate Platform succession in UK. The re-evaluation of the lithofacies architecture of a Derbyshire mud mound complex, developed in an intraplatform middle-ramp environment, led to the recognition of three lithofacies associations: (a) a 10 m thick basal unit of automicrite boundstone with siliceous sponge spicules and brachiopod–bryozoan packstone to wackestone beds; (b) a 10 m thick, 250 m wide, lens-shaped, convex-up massive core of clotted peloidal micrite and fenestellid bryozoan boundstone with sponge spicules; (c) inclined brachiopod–bryozoan–crinoid packstone flank beds. In the mud mound complex core, most of the carbonate mud with clotted peloidal and structureless micrite fabric is the result of biologically induced and influenced in-situ precipitation processes (automicrite). Brachiopods are not, as previously thought, limited to storm-scoured “pockets” in the mud mound complex core but are abundant and diverse in all lithofacies and lived on the irregular mud mound complex surface concentrating in depressions sustained by automicrite boundstone and the growth of bryozoans and sponges. The upper Visean Derbyshire mud mounds are, thus, representatives of a newly defined fenestellid bryozoan–brachiopod–siliceous sponge mud mound category, occurring in various middle–upper Visean Western European sites, a sub-type of the fenestellid bryozoan–crinoid–brachiopod Type 3 buildups of Bridges et al. (1995). These mud mounds, and other types of brachiopod-rich buildups, developed in carbonate platform settings between fair-weather and storm wave base, in dysphotic environments with dispersed food resources during the Visean. Brachiopod mud mound colonisation was favoured by moderate water depth, availability of food resources, and diverse substrates.

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Foraminifers in upper Viséan–lower Serpukhovian limestones (Mississippian) from South Wales: regional correlation and implications for British foraminiferal zonal schemes

Cited by 9 publications

References 70 publications

A late Asbian (Mississippian) stratotype for England: Trowbarrow Quarry, Cumbria, UK

A late Asbian (Mississippian) stratotype for England: Trowbarrow Quarry, Cumbria, UK

Maiaspora: the hallmark of gleichenioid ferns (Gleicheniales) from the early Carboniferous

Revisiting the upper Visean mud mounds from Derbyshire (UK): the role of brachiopods in their growth

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