Middle Ordovician brachiopods from Tagoat, Co. Wexford, SE Ireland: Dapingian diversity drivers

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY Geobios Pub Date : 2023-12-01 DOI:10.1016/j.geobios.2023.06.006
David A.T. Harper , Denis E.B. Bates
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Abstract

The Dapingian (Arenig) siltstones and sandstones of the Tagoat Group, County Wexford, SE Ireland, contain a well-preserved and diverse brachiopod fauna including a new genus of alimbellid, Palaeotagoatia (type species: Orthis Bailyana Davidson) together with the plectorthid Ffynnonia costata (Bates) hibernica nov. subsp. Of the 13 forms documented, at least six are conspecific with brachiopods from the upper Arenig (Dapingian-lowest Darriwilian) Treiorwerth Formation on Anglesey and a further two are identified with species occurring in the older Dapingian Carmel Formation. The faunal province affinities of the fauna are with those assemblages assigned to the peri-insular and marginal Celtic province and which occupied positions within the Middle Ordovician Iapetus Ocean between the Laurentian and Baltic platform provinces. More precise correlation of Middle Ordovician units suggests a significant species richness during the Dapingian-earliest Darriwilian and signalling also an early development of the Celtic province. But the shallow-water siliciclastic facies associated with these islands may also have influenced the distribution of some elements of the Celtic brachiopods and promoted the prevalence of coarse-ribbed orthides, such as Paralenorthis.

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爱尔兰东南部weexford Tagoat Co.的中奥陶世腕足类:大平纪多样性驱动因素
爱尔兰东南部韦克斯福德郡塔戈阿特组(Tagoat Group)的达平纪(阿雷尼格)粉砂岩和砂岩包含一个保存完好、种类繁多的腕足动物群,其中包括一个新的腕足动物属--Palaeotagoatia(模式种:Orthis Bailyana Davidson),以及桡足类 Ffynnonia costata (Bates) hibernica nov.在记录的 13 种形态中,至少有 6 种与安格尔西岛上阿雷尼格(大平期-达里维利期最低层)特雷奥韦尔斯地层中的腕足动物同属,另有 2 种与更早的大平期卡梅尔地层中的物种相吻合。该动物群的动物区系亲缘关系与那些被归入凯尔特周边地区和边缘地区的动物群系相近,这些动物群系占据了中奥陶世 Iapetus 洋中劳伦地台地带和波罗的海地台地带之间的位置。中奥陶世单元更精确的相关性表明,在大平洋-达里维利洋早期,物种非常丰富,这也标志着凯尔特省的早期发展。但是,与这些岛屿相关的浅水硅质岩层也可能影响了凯尔特腕足动物的某些成分的分布,并促进了粗肋腕足动物(如 Paralenorthis)的盛行。
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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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