The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District

Cooper, Anthony H.; Rushton, A. W. A.; Molyneux, Stewart G.; Hughes, Richard; Moore, R. M.; Webb, B. C.

doi:10.1017/s0016756800011742

Cited by 103 publications

(103 citation statements)

References 51 publications

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“…The paleontological data reported in Molyneux and Rushton [1988] have been supplemented by additional work in the Lake District [Cooper and Molyneux, 1990 ;Cooper et al, 1995]. These studies led to sudivision of the "messaoudensistrifidum assemblage" into five sub-assemblages based on the successive appearance and progressive disappearance of acritarch species [Cooper et al, 1995].…”

Section: Age Of the Investigated Unitmentioning

confidence: 99%

“…These studies led to sudivision of the "messaoudensistrifidum assemblage" into five sub-assemblages based on the successive appearance and progressive disappearance of acritarch species [Cooper et al, 1995]. Sub-assemblage 1, recovered from the Bitter Beck Formation, contains all characteristic taxa of the "messaoudensis-trifidum assemblage" together with species of the Veryhachium lairdii group.…”

Section: Age Of the Investigated Unitmentioning

confidence: 99%

“…According to Cooper et al [1995], sub-assemblage 1, on one hand, and sub-assemblages 2 and 3, on the other hand, would correspond respectively to the Araneograptus murrayi and the Hunnegraptus copiosus graptolite biozones, although the latter species has not been recorded in the Lake District. Both biozones are clearly of a pre-Tetragraptus phyllograptoides Biozone age and thus should be considered of latest Tremadocian age.…”

Section: Age Of the Investigated Unitmentioning

confidence: 99%

“…Since the description by Molyneux [in Molyneux and Rushton, 1988] of an acritarch assemblage from the Watch Hill Formation of the Skiddaw Group in the English Lake District, first named "trifidum flora" by Fortey et al [1991] and subsequently called the "messaoudii-trifidum assemblage" [Cooper et al, 1995] and "messaoudensis-trifidum assemblage" [Servais and Molyneux, 1997], more stratigraphical information about the age of this assemblage has been obtained from other formations in the same area. Originally attributed to an undifferentiated latest Tremadocianearliest Arenigian interval [Molyneux and Rushton, 1988], detailed investigations in the Skiddaw Group have enabled the distinction of five sub-assemblages of this microflora in the Bitter Beck, Watch Hill and lower Hope Beck formations [Cooper et al, 1995], and have provided an integrated graptolite and acritarch biozonation.…”

Section: Introductionmentioning

confidence: 99%

“…Originally attributed to an undifferentiated latest Tremadocianearliest Arenigian interval [Molyneux and Rushton, 1988], detailed investigations in the Skiddaw Group have enabled the distinction of five sub-assemblages of this microflora in the Bitter Beck, Watch Hill and lower Hope Beck formations [Cooper et al, 1995], and have provided an integrated graptolite and acritarch biozonation. Based on this study, it has been demonstrated that the "messaoudensis-trifidum assemblage" spans an interval from the latest Tremadocian age Araneograptus murrayi and ?…”

Section: Introductionmentioning

confidence: 99%

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Early Ordovician acritarchs of the Lierneux Member (Stavelot Inlier, Belgium): stratigraphy and palaeobiogeography

Vanguestaine

Servais

2002

Bulletin De La Société Géologique De France

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The messaoudensis-trifidum acritarch microflora is currently considered to be characteristic of latest Tremadocian-earliest Arenigian cold-water environments on the periphery of Gondwana, at high latitudes in the southern hemisphere. Integrated biostratigraphical studies on both acritarchs and graptolites are available from two areas of peri-Gondwana, the Lake District (northwestern England) and the Sierra Morena (southwestern Spain). The assemblage was also recorded from other areas on the northern border of the Gondwana continent where macrofossils are generally not available: from southern Ireland, the Isle of Man, southern Wales, the island of Rügen in northern Germany, the Prague Basin in the Czech Republic, and southern Turkey. While it appears that the messaoudensis-trifidum acritarch assemblage is limited to cold-water environments in localities on the periphery of Gondwana, some of its elements can be found in other areas. Some taxa, but not the complete assemblage, have been identified in the eastern Cordillera of Argentina, and some species of the assemblage are cited from continents which were situated at intermediate latitudes in warmer waters: some elements of the assemblage are described from localities of Baltica (from Norway, Estonia and the St. Petersburg area in northwestern Russia) and from the Yangzte Platform in southern China. In these regions, typical representatives of the messaoudensis-trifidum assemblage co-occur with taxa typical of temperate and warm-water areas. The present paper reports the discovery of the messaoudensis-trifidum acritarch assemblage in the Lierneux Member (Stavelot Inlier, Belgium). The Lierneux Member, which constitutes the uppermost part of the Jalhay Formation (formerly Salmian 1c) in the Stavelot Inlier, was first dated as late Tremadocian by Vanguestaine [1992a]. Following recent stratigraphical conclusions based on the detailed investigations of the messaoudensis-trifidum assemblage from different sequences of peri-Gondwana, the age of the Lierneux Member recovered from the Chevron borehole in the Stavelot Massif can now be confirmed as being probably latest Tremadocian. The discovery of the messaoudensis-trifidum assemblage in the Stavelot Inlier provides further evidence for the palaeogeographical distribution of the assemblage on the northern border of Gondwana and allows tentative correlations between eastern Belgium and northern Germany.

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Section: Age Of the Investigated Unitmentioning

confidence: 99%

Section: Age Of the Investigated Unitmentioning

confidence: 99%

Section: Age Of the Investigated Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early Ordovician acritarchs of the Lierneux Member (Stavelot Inlier, Belgium): stratigraphy and palaeobiogeography

Vanguestaine

Servais

2002

Bulletin De La Société Géologique De France

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A new record ofColpocoryphe (Trilobita) from the Skiddaw Group of the Cross Fell inlier, northern England

Romano

Webb²

2000

Geol. J.

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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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The stratigraphy, correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District

Abstract: Abstract:A new lithostratigraphy is presented for the Skiddaw Group (lower Ordovician) of the English Lake District. Two stratigraphical belts are described.

Cited by 103 publications

References 51 publications

Early Ordovician acritarchs of the Lierneux Member (Stavelot Inlier, Belgium): stratigraphy and palaeobiogeography

Early Ordovician acritarchs of the Lierneux Member (Stavelot Inlier, Belgium): stratigraphy and palaeobiogeography

A new record ofColpocoryphe (Trilobita) from the Skiddaw Group of the Cross Fell inlier, northern England

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

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