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The Silurian transgression of a palaeo-shoreline: the area between Old Radnor and Presteigne, Welsh Borderlands

Ray DC, Jarochowska E, Hughes HE, Claußen AL, Tingley AC, Moseley J, Bremer O (2021)

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Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2021

Journal

DOI: 10.2113/2021/7866176

Abstract

Quarries between Old Radnor and Presteigne, Welsh Borderlands, expose a Silurian nearshore succession, which onlaps a rocky palaeotopography of Neoproterozoic basement that had been uplifted along the Church Stretton Fault Zone. The succession documents the Aeronian to Sheinwoodian transgression of an island or islands, with the following sequence of events: deposition of shallow-marine sandstones (Folly Sandstone Formation); regional uplift; the preservation of a rocky-shoreline and associated deposits (Dolyhir Rudite Member); deposition of limestones characterised by a profusion of coralline algae and the abundant remains of reefs (Dolyhir and Nash Scar Limestone Formation); and finally the deposition of trilobitic silty-mudstones (basal Coalbrookdale Formation). Facies analysis, carbon isotope (δ¹³C_carb) values, sequence stratigraphy and collections of bryozoans, conodonts, thelodonts and trilobites, have been used here as a means of refining our stratigraphic understanding of this unique succession. The revised stratigraphy demonstrates many similarities with the adjoining Midland Platform and the wider Silurian world. Notable features include the globally recognised early Sheinwoodian carbon isotope excursion, and sea-level changes of regional and global extent. As one of the best examples of its kind, the palaeo-shoreline and nearshore succession of Old Radnor and Presteigne acts as a depositional model for ancient rocky shores worldwide.

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How to cite

APA:

Ray, D.C., Jarochowska, E., Hughes, H.E., Claußen, A.L., Tingley, A.C., Moseley, J., & Bremer, O. (2021). The Silurian transgression of a palaeo-shoreline: the area between Old Radnor and Presteigne, Welsh Borderlands. Lithosphere. https://doi.org/10.2113/2021/7866176

MLA:

Ray, David C., et al. "The Silurian transgression of a palaeo-shoreline: the area between Old Radnor and Presteigne, Welsh Borderlands." Lithosphere (2021).

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