Reappraisal of the ‘Cullenstown Formation’: Implications for the Lower Palaeozoic tectonic history of SE Ireland

Bennett, M. C.; Dunne, William M.; Todd, S. P.

doi:10.1002/gj.3350240406

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…10) comprises similar elements to the MCT. North of the Wexford Boundary Fault System, in the Leinster Basin, deformed low-grade quartz-and chlorite-rich turbidites of the Cullenstown Formation (mid-Cambrian Cahore Group, Bennett et al, 1989) probably correlate with lower parts of the South Stack Group (Tiezsch-Tyler and Phillips, 1989).…”

Section: Comparison With Cambrian-tremadocian Sequences Elsewhere In mentioning

confidence: 99%

The Anglo-Brabant Massif: Persistent but enigmatic palaeo-relief at the heart of western Europe

Pharaoh

2018

Proceedings of the Geologists' Association

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The research collaborations established resulted in numerous further publications, including a special publication of the Geological Society (Winchester et al., 2002). One of the most significant results was the elucidation of the history of the Anglo-Brabant Deformation Belt (not to be confused with the ABM) which links the Caledonides of England and Belgium. Many of the same authors contributed to the Southern Permian Basin Atlas (SPBA) published by TNO and EAGE (Pharaoh et al., 2010; De Vos et al., 2010). 2. Crustal and lithospheric structure The crustal structure of the ABM is less well known than that of surrounding regions, e.g. northern England and the region south of the Variscan Front. It was recognised from the exploration boreholes drilled in the pre-seismic era (1940s-1950s) that although coal-bearing basins are locally present on its northern margins, the massif is poorly prospective for oil and gas (Lees and Taitt, 1946; Falcon and Kent, 1960). Thus the dense networks of seismic reflection data acquired since 1970 in northern and southern England, which are so informative about the upper crustal and sedimentary basin structure in those areas (e.g. Whittaker, 1985; Kirby et al., 2000; Smith et al., 2005; Pharaoh et al., 2011) are largely absent over the massif. Significant coverage is only present in the NW (Staffordshire), the Worcester Graben and Oxfordshire Concealed Coalfield areas (Butler, in press). A small number of seismic reflection profiles, gathered by the British Geological Survey (Chadwick, 1985; Chadwick and Smith, 1988) and academic institutions (e.g. Maguire, 1987) provide limited insights to crustal structure. The massif is crossed by only one long lithospheric-scale seismic refraction profile (Lithospheric Seismic Profile in Britain, LISPB) acquired in 1974 (Bamford et al., 1976). The GAMMA segment ends in Buxton, just beyond the northern edge of the massif (Barton, 1992). The DELTA segment extends from North Wales to the Isle of Portland and an interpretation was published by Maguire et al. (2011). The segment crosses the massif in its west central part, intersecting shorter refraction profiles in the Bristol Channel area (Mechie and Brooks, 1984). Deep seismic reflection data, recorded to 12 or 15 s Two-Way Travel Time (TWTT) by the British Institutions Reflection Profiling Syndicate (BIRPS), based at Cambridge University, cover only the offshore area (Klemperer and Hobbs, 1991). These profiles are nevertheless useful in assessing the tectonic milieu of the massif. Deep seismic reflection data from northern France (Cazes and Toreilles, 1988) and Belgium (Bouckaert et al., 1988; Meissner and Bortfeld, 1990) demonstrate a gently southward-dipping Variscan detachment, with the crust of the ABM forming a tapering wedge in the footwall (Blundell, 1993). The latter extends some 60 to 100 km south of the Variscan Front, and its nature is confirmed by the continuity of the South Central England Magnetic Anomaly beneath the Variscan nappes (Beamish et al., 2016). Interpretations of crustal...

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Section: Comparison With Cambrian-tremadocian Sequences Elsewhere In mentioning

confidence: 99%

The Anglo-Brabant Massif: Persistent but enigmatic palaeo-relief at the heart of western Europe

Pharaoh

2018

Proceedings of the Geologists' Association

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Acritarchs from the Lower Palaeozoic succession on the south County Wexford coast, Ireland: new age constraints for the Cullenstown Formation and the Cahore and Ribband Groups

Bruck

Vanguestaine

2004

Geological Journal

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Lower Palaeozoic sediments crop out on the southern coast of County Wexford, Ireland, comprising three distinctive lithostratigraphical units: from west to east the Cahore Group, the Blackhall Formation of the Ribband Group and the Cullenstown Formation. The three units are largely devoid of macrofossils and thus their ages have to date been uncertain and, in the case of the Cullenstown Formation, speculative. In the Cahore Group, a diverse assemblage of acritarchs composed of seventeen species has been recorded indicating a middle Early Cambrian age. This is similar to the age of the lithologically identical Bray Group to the north, in County Wicklow. In the Ribband Group, two very distinct assemblages have been noted. Both are poorly preserved, but diagnostic species have been determined giving a biostratigrapical range of early Mid‐Cambrian to Llanvirn. Palynomorphs have been recorded for the first time from the Cullenstown Formation allowing comparison with eastern Newfoundland where a similar, less diverse assemblage has been recorded. The age indicated is latest Mid‐Cambrian to early Late Cambrian. Overall, despite generally poor preservation of the organic matter, some 45 acritarch species have been distinguished, among which one new combination is proposed: Retisphaeridium postae instead of Cymatiosphaera postae. Copyright © 2004 John Wiley & Sons, Ltd.

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Provenance and Paleozoic tectonic evolution of Ganderia and its relationships with Avalonia and Megumia in the Appalachian-Caledonide orogen

et al. 2021

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Reappraisal of the ‘Cullenstown Formation’: Implications for the Lower Palaeozoic tectonic history of SE Ireland

Cited by 6 publications

References 16 publications

The Anglo-Brabant Massif: Persistent but enigmatic palaeo-relief at the heart of western Europe

The Anglo-Brabant Massif: Persistent but enigmatic palaeo-relief at the heart of western Europe

Acritarchs from the Lower Palaeozoic succession on the south County Wexford coast, Ireland: new age constraints for the Cullenstown Formation and the Cahore and Ribband Groups

Provenance and Paleozoic tectonic evolution of Ganderia and its relationships with Avalonia and Megumia in the Appalachian-Caledonide orogen

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