Macrofloral biostratigraphy of the Newent Coalfield, Gloucestershire

Cleal, Christopher J.

doi:10.1002/gj.3350220304

Cited by 16 publications

(13 citation statements)

References 19 publications

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“…Laveine (1977) also noted a significant change in the macrofloral and palynological record in the middle Asturian Substage, involving the appearance of a number of abundant species of marattialean ferns and medullosalean pteridosperms. Detailed records from South Wales (Cleal, 1978), Saarland (Cleal, 1984a), the Canadian Maritimes (Zodrow & Cleal, 1985), southern England (Cleal, 1986(Cleal, , 1987(Cleal, , 1997 and northern Spain (Wagner & Alvarez-Vázquez, 1991) have since shown that the change in fact occurs in two steps, which has resulted in a three-fold biostratigraphical division of the Asturian Substage (Cleal & Thomas, 1994;Cleal et al 2006). Detailed records from South Wales (Cleal, 1978), Saarland (Cleal, 1984a), the Canadian Maritimes (Zodrow & Cleal, 1985), southern England (Cleal, 1986(Cleal, , 1987(Cleal, , 1997 and northern Spain (Wagner & Alvarez-Vázquez, 1991) have since shown that the change in fact occurs in two steps, which has resulted in a three-fold biostratigraphical division of the Asturian Substage (Cleal & Thomas, 1994;Cleal et al 2006).…”

Section: A Linopteris Obliqua Zonementioning

confidence: 99%

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A comparative analysis of some Late Carboniferous basins of Variscan Europe

Opluštil

Cleal

2007

Geol. Mag.

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Vegetation diversity and pattern changes, and their relation to tectono-sedimentary histories are compared between selected Euramerican Late Palaeozoic coalfields, to understand better the controls on the dynamics of the Pennsylvanian terrestrial ecosystems and to demonstrate the problems with comparing data from various basins. The analysis is based on data from the following basins of different geotectonic and palaeogeographical positions: the cratonic Pennines Basin, the foreland South Wales and Upper Silesia basins, and the fault-related Intra Sudetic and Central and Western Bohemia basins. The analysis indicates that complex factors are responsible for changes in plant diversity and vegetation patterns. These are related to climate, tectonics, preservation potential, sampling biases and the current state of revision of the flora in each basin. Plant diversity patterns in the basins differ because of local controls and/or the character and detail of the available data. Maximum diversity varies among the basins within the Langsettian and Duckmantian substages. Two apparent step-like drops in diversity were detected within coal-bearing strata of most basins: at the Duckmantian/Bolsovian boundary and at the Bolsovian/Asturian boundary. Further and more prominent falls are related to transitions from coal-bearing to non-coal-bearing (mostly red bed) strata or vice versa during Stephanian times. Interpretation of climatic signals recorded in the sedimentary successions indicates that Westphalian and middle Stephanian times were wet intervals, whereas early and late Stephanian times were drier.

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Section: A Linopteris Obliqua Zonementioning

confidence: 99%

“…8). Cleal, 1978Cleal, , 1984aCleal, , 1987Pfefferkorn & Thomson, 1982;Zodrow & Cleal, 1985;Wagner & Alvarez-Vázquez, 1991). As in the Central Pennines Basin, there is also a fall in species diversity to about 40 species per horizon in the South Wales Basin, but it occurs significantly later, in the Bolsovian Substage (Figs 3, 5).…”

Section: D Fossil Recordmentioning

confidence: 99%

A comparative analysis of some Late Carboniferous basins of Variscan Europe

Opluštil

Cleal

2007

Geol. Mag.

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“…By Westphalian D times, the topography of the Wales-Brabant High was subdued, with major connections existing between the Pennine Basin and basins to the south (Kellaway 1970;Cleal 1987;Besly 1988;Foster et al 1989). Exploration has shown that the Nottinghamshire Coalfield extends both east and south.…”

Section: Influence Of Palaeogeography and Palaeoclimatementioning

confidence: 99%

Sedimentary facies of the coal-bearing Westphalian A and B north of the Wales-Brabant High

Guion

Fulton

Jones

1995

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Important coal deposits are present in Britain north of the Wales-Brabant High in the Pennine Basin, which was initiated by late Devonian to early Carboniferous extension. The formation of coals of sufficient thickness, quality and continuity to be commercially exploited was favoured during the latest Westphalian A (Langsettian) and much of the Westphalian B (Duckmantian), when deposition took place in an environment similar to an upper delta plain, with limited marine influence. During the early part of the Westphalian A, marine influence was important, with the consequence that the coals were thinner, less persistent and of inferior quality. By the late Westphalian, alluvial deposition became important, and coals of commercial quality are rare.Accurate determination of facies, lithological attributes and geometry is an important tool in exploration and mine planning. Sedimentary facies have thus been rationalized into those that may be consistently recognizable in boreholes and mine workings. However, facies may be further subdivided when conditions allow, and intermediate facies exist, reflecting the complexities of depositional environments. The characteristics of the following facies are described here: mire, palaeosol,/narine, lacustrine, lacustrine delta, major channel, minor channel, overbank and crevasse splay. Channel deposits have a number of adverse effects on mining and the range of channel-fill deposits reflects the operation of many different processes.A model of sedimentation is presented which emphasizes that local sedimentary and autocyclic processes, local tectonics, subsidence and compaction were important in controlling the distribution of facies at a mine scale.

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“…This suggests a stratigraphical gap between the Pennant Sandstone Formation and the Grovesend Formation that is probably related to a tectonic-induced hiatus referred to as the Leonian Phase of the Variscan Orogeny (sensu Wagner, 1966). This tectonic event also manifests itself as a hiatus in eastern South Wales (and marks the onset of coal-bearing deposition in the Forest of Dean, Severn, newent and Oxfordshire coalfields (Cleal, 1986;1987;1997).…”

Section: Megaspores and Large Pollen Grains: A Palaeobotanical Perspementioning

confidence: 96%

Pennsylvanian (mid-Bolsovian to Asturian) megaspores and large pollen of the Bristol Coalfield, UK

Pendleton

Wellman

2013

J. Micropalaeontol.

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A detailed account of assemblages of megaspores and large pollen grains from the midBolsovian to late Asturian Warwickshire Group (Winterbourne, Pennant Sandstone and Grovesend formations) of the Bristol Coalfield is presented. The megaspore assemblages show certain similarities to those from the well-documented, and partly coeval, sequence in the nearby Forest of Dean Coalfield. However, the Bristol Coalfield megaspore assemblages are generally less diverse. We consider the palaeoecological implications of the megaspore assemblages and conclude that differing depositional settings had different vegetational successions (including differences in the composition and diversity of megaspore-producing plants). A consideration of megaspore biostratigraphy suggests that the uppermost Pennant Sandstone Formation may be of early Asturian age, suggesting that the postulated gap between the Pennant Sandstone Formation and overlying Grovesend Formation is smaller than previously suggested. We also report the first European occurrence of the large enigmatic pteridosperm pollen grain Parasporites maccabei Schopf, 1938.

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Macrofloral biostratigraphy of the Newent Coalfield, Gloucestershire

Cited by 16 publications

References 19 publications

A comparative analysis of some Late Carboniferous basins of Variscan Europe

A comparative analysis of some Late Carboniferous basins of Variscan Europe

Sedimentary facies of the coal-bearing Westphalian A and B north of the Wales-Brabant High

Pennsylvanian (mid-Bolsovian to Asturian) megaspores and large pollen of the Bristol Coalfield, UK

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