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

Harper, David A.T.; Bates, Denis E.B.

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.

Citation

Harper, D. A., & Bates, D. E. (2023). Middle Ordovician brachiopods from Tagoat, Co. Wexford, SE Ireland: Dapingian diversity drivers. Geobios, 81, 85-100. https://doi.org/10.1016/j.geobios.2023.06.006

• Journal Article Type: Article
• Acceptance Date: Jun 19, 2023
• Online Publication Date: Aug 7, 2023
• Publication Date: 2023-12
• Deposit Date: Jan 15, 2024
• Publicly Available Date: Jan 15, 2024
• Journal: Geobios
• Print ISSN: 0016-6995
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 81
• Pages: 85-100
• DOI: https://doi.org/10.1016/j.geobios.2023.06.006
• Keywords: Space and Planetary Science; Paleontology
• Public URL: https://durham-repository.worktribe.com/output/2146842