Late Ordovician (Sandbian) brachiopods from the Mweelrea Formation, South Mayo, western Ireland: stratigraphic and tectonic implications

Harper, David A. T.; Parkes, Matthew A.; McConnell, Brian

doi:10.1002/gj.1210

Cited by 14 publications

(6 citation statements)

References 20 publications

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“…However, palaeontological data presented by Harper and Parkes (2000) and Harper et al (2010) indicate that the top of the Mweelrea Formation extends into the Caradoc, probably younger than the Rosroe Formation. This indicates coeval deposition of the Mweelrea and Rosroe formations for some portion of their history.…”

Section: Rosroe Formationmentioning

confidence: 90%

A revision of the Ordovician stratigraphy for the western Ireland Caledonides and implications for tectonic models

et al. 2010

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The western Ireland Ordovician stratigraphy has been previously used to constrain the timing of docking of an island arc and its fore-arc basin with the margin of Laurentia for the British and Irish Caledonides. New field relationships and age data indicate that one of the key formations, the Rosroe Formation (459.2 AE 0.8 and 465.1 AE 2.1 Ma), and its supposed lateral equivalent, the Maumtrasna Formation are younger than previously interpreted. New age data for a tuff band in the Maumtrasna Formation (468.9 AE 1.3 Ma) also support previous studies showing it can be correlated to the adjacent Mweelrea Formation. The new field evidence, age data and geochemistry contradict some previous studies and show that the Maumtrasna, Rosroe and Derrylea formations can no longer be considered lateral equivalents. Based on the new stratigraphy a revised tectonic model is required with sedimentation in this part of the Caledonides taking place in a fore-arc basin outboard of a continental arc and the oceanic arc was an along-strike equivalent of this arc situated in an embayment of the Laurentian margin.

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Section: Rosroe Formationmentioning

confidence: 90%

A revision of the Ordovician stratigraphy for the western Ireland Caledonides and implications for tectonic models

et al. 2010

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“…His output ranged from the Geological Society's correlation of the Ordovician (Fortey et al 2000), to books on Irish geology county by county and much more besides (see bibliography). Matthew produced high quality papers on Irish Paleozoic faunas that included studies on brachiopods Harper et al 1990Harper et al , 2010, trilobites (Parkes and Owen 1994;Parkes 1996, 2000), Caradoc and Telychian faunas of south east and north west Ireland respectively (Parkes et al 2017;, and he also contributed to an assessment of elements of the significant Pennsylvanian Jarrow fauna (Orr et al 1996).…”

Section: The Geologistmentioning

confidence: 99%

An appreciation: Matthew Alastair Parkes (1961–2020)

Monaghan¹,

Simms²,

Jackson³

et al. 2022

Irish Journal of Earth Sciences

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Matthew Parkes was a highly respected geologist and good friend to many who knew him. His legacy is his enduring scientific research, published in many popular articles, journals and books. It was important to him that geology was not only thoroughly researched and published for the scientific community, but that it should also be made fully accessible for the general public, particularly for any budding geologist. Once Matthew discovered geology as a teenager, the fascination never waned, and his work covered a wide expanse of geoscience topics across many countries.

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“…They have sharp bases, coarsen up into more typical Mweelrea Formation sandstones and are locally bioturbated and ripple laminated, indicating a shallow-marine environment with minor wave activity. Shallow-marine faunas indicate early to middle Llanvirn ages for the lower two slate units (Stanton, 1960;Williams, 1972;Pudsey, 1984a) and an early Caradoc age for the upper one (Harper et al, 2010).…”

Section: Mweelrea Formationmentioning

confidence: 99%

Sedimentary response to ignimbrite emplacement across a fluvial–shallow‐marine transition: Ordovician Mweelrea Formation, South Mayo Trough, Western Ireland

Riggs

McConnell

2016

Geological Journal

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The Ordovician Mweelrea Formation is part of the basin fill of the South Mayo Trough in western Ireland and records progradation of alluvial facies northwestward across shallow-and marginal-marine Mweelrea 'passage beds' to marine Glenummera Formation facies. Early in Mweelrea Formation sedimentation, the first of a series of ignimbrites was emplaced, causing a disruption in this progradation. The preserved thickness of the ignimbrite is up to ca. 12 m, and the sedimentary response varied depending on the environment that was affected. Eastern exposures of the Mweelrea Formation are coarse grained and represent fluvial facies. Emplacement of the ignimbrite caused overlying sediment to become richer in feldspar as well as coarser grained; heavy-mineral laminations are common here and in many supra-ignimbrite exposures, but the depositional style was unchanged. The ignimbrite overlies decreasing thickness of fluvial sandstone towards the west to where it directly overlies shoreline and shallow-marine passage beds. Here, sandstone that overlies the ignimbrite is fluvial, indicating that emplacement of the ignimbrite brought about an abrupt progradation. At the westernmost outcrops of Mweelrea Formation, the ignimbrite lies at the contact with the underlying marine Glenummera Formation. Marine sedimentation continued after emplacement of the ignimbrite, although a coarse conglomerate horizon immediately overlying the ignimbrite together with development of a delta suggests that sediment input was vastly increased.

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Late Ordovician (Sandbian) brachiopods from the Mweelrea Formation, South Mayo, western Ireland: stratigraphic and tectonic implications

Cited by 14 publications

References 20 publications

A revision of the Ordovician stratigraphy for the western Ireland Caledonides and implications for tectonic models

A revision of the Ordovician stratigraphy for the western Ireland Caledonides and implications for tectonic models

An appreciation: Matthew Alastair Parkes (1961–2020)

Sedimentary response to ignimbrite emplacement across a fluvial–shallow‐marine transition: Ordovician Mweelrea Formation, South Mayo Trough, Western Ireland

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