A comparison of the Ribband Group (southeastern Ireland) to the Manx Group (Isle of Man) and Skiddaw Group (northwestern England)

McConnell, Brian; Morris, John H.; Kennan, P. S.

doi:10.1144/gsl.sp.1999.160.01.22

Cited by 21 publications

(13 citation statements)

References 16 publications

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“…6; Brenchley & Treagus 1970;McConnell 2000). Age control on the Ribband Group is poor (McConnell et al 1999); a varicosus Biozone age for the Oaklands Formation (Rushton 1996) suggests a correlation with the Prioryland Formation at Bellewstown, in agreement with correlation on lithological grounds (Murphy 1987;Kennan & Murphy 1993). Thus it appears that, in the southern part of Leinster, the sequence equivalent to the Hilltown Formation of Bellewstown is missing below the unconformity, which has been related to a Monian orogenic event to the south (Tietzsch-Tyler 1996).…”

Section: Discussionmentioning

confidence: 80%

“…1; Murphy 1987;Vaughan & Johnston 1992). The oldest exposed rocks are early Ordovician slates and siltstones with slump breccias and coticules of the Prioryland Formation (Harper & Rast 1964;Murphy 1987 1993; McConnell et al 1999). The Prioryland Formation is overlain, with uncertain contact relations, by the c. 480 m thick Hilltown Formation of early to mid-Ordovician felsic volcanic and finegrained metasedimentary rocks (Harper & Rast 1964;Murphy 1987).…”

Section: Geological Settingmentioning

confidence: 99%

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No Exploits back-arc basin in the Iapetus suture zone of Ireland

McConnell

Parkes

Crowley

et al. 2015

JGS

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A controversial aspect of the closure history of the Iapetus Ocean concerns the existence of the Exploits basin in Ireland and Britain. The Exploits-Tetagouche back-arc basin of the Canadian Appalachians opened during the Middle Ordovician as the Popelogan-Victoria volcanic arc migrated northwards from the Ganderian margin. The Bellewstown Terrane, within the Iapetus suture zone of Ireland, lies between the Ganderian-Avalonian Leinster Terrane and the Laurentian Grangegeeth Terrane. An early Ordovician 'Celtic' shelly fauna is hosted in volcanogenic breccia that we demonstrate is stratigraphically overlain by shales with no volcanic horizons. The lower 24 m of shale are unfossiliferous, but shale above this stratigraphic level has yielded a new graptolite fauna consistent with the upper part of the artus Biozone (Darriwilian, c. 464 Ma). U-Pb zircon dating of the volcanic horizon yields an age of c. 474 Ma. The shale, therefore, appears to represent c. 10 myr of deposition and a significant gap in volcanism. This, together with a Sandbian Anglo-Welsh fauna, suggests that the Bellewstown Terrane remained in a peri-Gondwanan position throughout the Ordovician. Hence, Exploits back-arc basin opening and Ganderian arc migration did not occur in the Irish sector of Iapetus.

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Section: Discussionmentioning

confidence: 80%

Section: Geological Settingmentioning

confidence: 99%

No Exploits back-arc basin in the Iapetus suture zone of Ireland

McConnell

Parkes

Crowley

et al. 2015

JGS

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“…It has been proposed that the Ribband Group has correlatives along strike to the northeast with at least part of the Manx Group of the Isle of Man and the Skiddaw Group of the Lake District (McConnell et al 1999). In addition, Todd et al (2000) have also recently correlated the Early Ordovician Annascaul Formation of the Dingle Peninsula in southwest Ireland with parts of the Ribband Group, the Manx Group, and more tentatively with possible equivalents in Newfoundland (Kennedy 1979).…”

Section: Discussionmentioning

confidence: 99%

“…The productive samples here indicated an early Mid-Cambrian to Llanvirn age (Brück and Vanguestaine 2004). McConnell et al (1999) have proposed some tentative but interesting correlations between some of the Ribband Group formations of southeast Ireland and possible equivalents in the Manx Group of the Isle of Man and the Skiddaw Group of the Lake District. While more work is needed, it is clear that the Ribband Group formations seen in the Muggort's Bay inlier have overall lithofacies similarities to some of the Manx Group.…”

Section: Comparison With the Ribband Group Elsewhere In Leinster And mentioning

confidence: 99%

An Ordovician age for the Muggort's Bay Lower Palaeozoic inlier, County Waterford, Ireland—the southernmost exposure of the Irish Caledonides

Bruck

Vanguestaine

2005

Geol. J.

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The most southerly exposed Lower Palaeozoic strata in Ireland occur on the southwest coast of County Waterford along a 2.5 km long coastal section at Muggort's Bay where they are surrounded by Devonian rocks. Five formations can be distinguished which, in ascending order, are: the Ballycurreen, Carrickbrean, Rathnameenagh, Moanbrack and Killinoorin formations. The total thickness of the succession is over 1800 m. No macrofossils are present, but the lithologies are largely fine-grained turbidites and subordinate volcanic rocks which closely resemble the Ribband Group seen elsewhere in southeast Ireland and have previously therefore been classified with it. Palynological analysis was undertaken on 25 samples collected from Muggort's Bay, of which eight were productive. Diagnostic microfossils, comprising acritarchs, chitinozoans and scolecodonts, indicate an Early to Middle Ordovician age for both the Rathnameenagh and the Moanbrack formations. These ages confirm that the strata are part of the Ribband Group which elsewhere has been biostratigraphically dated as ranging from Mid-Cambrian to Mid-Ordovician. Reworked mid-Middle Cambrian acritarchs occur in the Moanbrack Formation and reworked late Middle to early Late Cambrian acritarchs in the Rathnameenagh Formation. Despite generally poor preservation of the organic matter, some 20 acritarch species have been distinguished. Among these, three species belong to the herein revised genus Retisphaeridium for which an emended diagnosis is proposed together with two new combinations, Retisphaeridium capsulatum (Jankauskas, 1976) Vanguestaine nov. comb. and Retisphaeridium pusillum (Moczydlowska, 1998) Vanguestaine nov. comb.

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“…We consider that the assignment of this succession to the Caradoc Duncannon Group (Tietzsch-Tyler and Sleeman 1994) is erroneous and that the Caradoc graptolite fauna which has been reported from one locality by Dhonau (1970Dhonau ( , 1973 occurs in a small down-faulted block of Duncannon Group sediments, lithologically similar to the Ribband Group, within the dominantly Ribband Group succession. Recently, McConnell et al (1999) have proposed some tentative but interesting correlations between some of the Ribband Group formations of southeast Ireland and possible equivalents in the Manx Group of the Isle of Man and the Skiddaw Group of the Lake District. While more work is needed, it is clear that the Blackhall Formation has overall lithofacies similarities to some of the younger parts of the Manx Group.…”

Section: Discussionmentioning

confidence: 99%

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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A comparison of the Ribband Group (southeastern Ireland) to the Manx Group (Isle of Man) and Skiddaw Group (northwestern England)

Cited by 21 publications

References 16 publications

No Exploits back-arc basin in the Iapetus suture zone of Ireland

No Exploits back-arc basin in the Iapetus suture zone of Ireland

An Ordovician age for the Muggort's Bay Lower Palaeozoic inlier, County Waterford, Ireland—the southernmost exposure of the Irish Caledonides

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

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