Sequence stratigraphy of the Upper Yeadonian of northern England

Maynard, James R.

doi:10.1016/0264-8172(92)90091-r

Cited by 40 publications

(34 citation statements)

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“…Thus, we interpret the marine bands to represent maximum flooding surfaces (sensu Van Wagoner et al 1990) developed during rises in relative sea-level (Figure 8). A similar interpretation has been applied to the Cancellatum, Cumbriense and Subcrenatum Marine Bands in other parts of the Central Province Basin (Maynard 1992;Church and Gawthorpe 1994;Hampson et al 1996).…”

Section: Marine Bands and Maximum Flooding Surfacesmentioning

confidence: 63%

“…Hampson et al 1997). However, the sequence boundary at the base of the Aqueduct Grit can be correlated to an equivalent surface at the base of the Rough Rock braided-fluvial complex farther north and east in the Central Province Basin (Maynard 1992;Church and Gawthorpe 1994;Hampson et al 1996). The uniform, braided-fluvial character of the Aqueduct Grit, and the absence of fine-grained and/or tidally-influenced deposits in its upper part, suggests that it constitutes part of a lowstand systems tract (Van Wagoner et al 1990;Hampson et al 1997Hampson et al , 1999a.…”

Section: Sequence Boundaries and Incised Valley-fill Complexesmentioning

confidence: 97%

“…Correlation of stratal surfaces between vertical sections is aided by conceptual sequence stratigraphic models (Posamentier and Vail 1988;Van Wagoner et al 1990), including those developed for Millstone Grit strata in adjacent basins (e.g. Maynard 1992;Church and Gawthorpe 1994;Martinsen et al 1995;Hampson 1997Hampson , 1998Hampson et al 1997;Jones and Chisholm 1997;O'Mara et al 1999;George 2001). Figure 8 shows a summary correlation panel illustrating the resulting sequence stratigraphic framework.…”

Section: Sequence Stratigraphic Frameworkmentioning

confidence: 99%

“…Within the biostratigraphic framework defined by the marine bands, key stratal surfaces are identified on the basis of vertical facies juxtapositions and stacking patterns (cf. the methodology of Maynard 1992;Church and Gawthorpe 1994;Hampson et al 1997). Correlation of stratal surfaces between vertical sections is aided by conceptual sequence stratigraphic models (Posamentier and Vail 1988;Van Wagoner et al 1990), including those developed for Millstone Grit strata in adjacent basins (e.g.…”

Section: Sequence Stratigraphic Frameworkmentioning

confidence: 99%

“…Maynard 1992;Church and Gawthorpe 1994;Martinsen et al 1995;Hampson et al 1996Hampson et al , 1997Wignall and Maynard 1996;Hampson 1997Hampson , 1998Jones and Chisholm 1997;O'Mara et al 1999;George 2001). This paper presents the first application of sequence stratigraphy to the Millstone Grit succession of North Wales, building on previous descriptions of its sedimentology and stratigraphy (Morton 1876;Strahan 1885Strahan , 1890Wood 1936;Jones and Lloyd 1942;Ramsbottom 1974;Davies et al 2004).…”

Section: Introductionmentioning

confidence: 97%

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Sequence stratigraphy of the upper Millstone Grit (Yeadonian, Namurian), North Wales

Jerrett¹,

Hampson²

2007

Geological Journal

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The upper Millstone Grit strata (Yeadonian, Namurian) of North Wales have been studied using sedimentological facies analysis and sequence stratigraphy. These strata comprise two cyclothems, each containing prodelta shales (Holywell Shale) that pass gradationally upwards into delta-front and delta-plain deposits (Gwespyr Sandstone Formation). The deltas formed in shallow water (<100 m), were fluvial-dominated, had elongate and/or sheet geometries and are assigned to highstand systems tracts. Two delta complexes with distinctive sandstone petrographies are identified: (1) a southerly derived, quartzose delta complex sourced locally from the Wales-Brabant Massif, and (2) a feldspathic delta complex fed by a regional source(s) to the north and/or west. The feldspathic delta complex extended further south in the younger cyclothem. A multistorey braided-fluvial complex (Aqueduct Grit, c. 25 m thick) is assigned to a lowstand systems tract, and occupies an incised valley that was eroded into the highstand feldspathic delta complex in the younger cyclothem. A candidate incised valley cut into the highstand feldspathic delta complex in the older cyclothem is also tentatively identified. Transgressive systems tracts are thin (<5 m) and contain condensed fossiliferous shales (marine bands). The high-resolution sequence stratigraphic framework interpreted for North Wales can be readily traced northwards into the Central Province Basin ('Pennine Basin'), supporting the notion that high-frequency, high-magnitude sea-level changes were the dominant control on stratigraphic architecture.

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Section: Marine Bands and Maximum Flooding Surfacesmentioning

confidence: 63%

Section: Sequence Boundaries and Incised Valley-fill Complexesmentioning

confidence: 97%

Section: Sequence Stratigraphic Frameworkmentioning

confidence: 99%

Section: Sequence Stratigraphic Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Sequence stratigraphy of the upper Millstone Grit (Yeadonian, Namurian), North Wales

Jerrett¹,

Hampson²

2007

Geological Journal

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The Roaches and Ashover Grits: sequence stratigraphic interpretation of a ‘turbidite-fronted delta’ system

Jones¹,

Chisholm

1997

Geol. J.

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A single Upper Carboniferous¯uvio-deltaic cycle (Namurian, R 2 b5) in the south part of the Pennine Basin of northern England has been reinterpreted using a sequence stratigraphic approach. In upward succession the deposits comprise basinal mudstones, localized thick density current deposits, delta slope deposits and delta-top sandstones, followed abruptly by basinal mudstones. Earlier interpretations linked these elements with a single, mainly regressive, cycle, referred to as a turbidite-fronted delta. Recent evidence for strong glacio-eustatic sea-level¯uctuations in the Namurian suggests that it is unlikely that the previous simple model can explain the spatial arrangement of all the lithological units. This paper attempts to identify elements of the Exxon sequence stratigraphic model, in which changes of sea level are an essential part.The basinal mudstones represent deep-water deposition and imply a highstand of sea level. Thick density current deposits are now known to be localized close to the basinward limit of delta progradation, so cannot be seen as a ubiquitous component of the depositional system. They may form a detached fan, or a fan located at the foot of the delta slope. Slope siltstones include turbidite-like sandstones, but these are interbedded with tractional sandstones and Pelecypodichnus trace fossils, giving no clear indication of water depth. The delta-top sandstones, some coarse and pebbly, can in places be shown to consist of two parts separated by a signi®cant erosion surface now regarded as a type 1 sequence boundary. The erosion surface is locally incised about 80 m into the delta deposits, forming a major palaeovalley. Giant cross-beds (foresets 20 m thick) forming part of the palaeovalley ®ll are restricted to the basinward end of this feature.A curve of relative sea level inferred for the R 2 b5 interval suggests a fourth-order cycle in which two sharp rises are separated by a gradual fall. Possible minor (®fth-order) rises and falls may be superimposed.

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Evidence for relative sea-level falls during deposition of the Upper Carboniferous Millstone Grit, South Wales

Hampson

1998

Geol. J.

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Detailed sedimentological facies analysis of the fluvio‐deltaic Millstone Grit succession (Upper Carboniferous) of South Wales reveals that a number of cyclothems bounded by marine flooding surfaces (marine bands) in these strata exhibit facies architectures that represent erosion, non‐deposition and/or deposition during periods of falling relative sea‐level. A major fluvial complex below the Subcrenatum Marine Band, the Farewell Rock, lies within an incised valley, with a regional unconformity (sequence boundary) at its base. This unconformity is marked by deep erosional relief, an identifiable time gap and an angular discordance in bedding. The Cumbriense Quartzite, a correlative unit containing several mature palaeosols, records a depositional hiatus on a terrace‐like interfluve that lay beyond the margins of the coeval Farewell Rock valley. Cyclothems in the underlying Middle Shales contain additional surfaces and units of subtler character. Beneath the Cancellatum Marine Band, a thin (15 cm), calcareous siltstone bed (the ‘Amroth Granule Bed’) that directly overlies prodelta shales contains reworked bioclasts, bored phosphorite clasts and quartz granules. Quartz granules in this bed are interpreted to represent relict lowstand, fluviatile? deposits, which were reworked during later transgression. Three further cyclothems contain sharp‐based, storm‐reworked mouth bars that record an abrupt lowering of wave base, most probably during periods of falling relative sea‐level. One of these cyclothems also contains a distributary channel complex, which records an abrupt influx of coarse‐grained sediment of ambiguous origin. The significance of these subtle surfaces and units for intracyclothem stratigraphy has rarely been considered; their prevalence in the Middle Shales provides evidence for numerous, high‐frequency relative sea‐level falls, which were previously unrecognized. These relative sea‐level falls appear to alternate coherently with the widespread sea‐level rises recorded by the marine bands, suggesting that glacio‐eustasy is their most likely driving mechanism. The notion of glacio‐eustatic sea‐level falls is supported by the correlation of the basal Farewell Rock sequence boundary with sequence boundaries documented in adjacent basins. The angular unconformity and a change in sediment provenance at the base of the Farewell Rock, however, suggest an additional tectonic control on stratigraphic architecture here, namely a short‐lived phase of rifting or inversion prior to widespread fluvial incision. Copyright © 1998 John Wiley & Sons, Ltd.

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Sequence stratigraphy of the Upper Yeadonian of northern England

Cited by 40 publications

References 6 publications

Sequence stratigraphy of the upper Millstone Grit (Yeadonian, Namurian), North Wales

Sequence stratigraphy of the upper Millstone Grit (Yeadonian, Namurian), North Wales

The Roaches and Ashover Grits: sequence stratigraphic interpretation of a ‘turbidite-fronted delta’ system

Evidence for relative sea-level falls during deposition of the Upper Carboniferous Millstone Grit, South Wales

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