Editing Westphalian mid-A to mid-C depositional controls, UK Pennine Basin: regional analyses and their relevance to southern North Sea interpretations

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[[File:YGS_CHR_07_WEST_FIG_01.jpg|thumbnail|Figure 1 Tectonic framework of the main UK onshore Upper Carboniferous coalfields (based on Rippon 1997).]]
 
[[File:YGS_CHR_07_WEST_FIG_01.jpg|thumbnail|Figure 1 Tectonic framework of the main UK onshore Upper Carboniferous coalfields (based on Rippon 1997).]]
 
[[File:YGS_CHR_07_WEST_FIG_02.jpg|thumbnail|Figure 2 Stratigraphical summary of the UK coal-bearing Westphalian A–C (based on Guion et al. 1995b). Phases 1 to 5 are detailed in Section 1 of the text.]]
 
[[File:YGS_CHR_07_WEST_FIG_02.jpg|thumbnail|Figure 2 Stratigraphical summary of the UK coal-bearing Westphalian A–C (based on Guion et al. 1995b). Phases 1 to 5 are detailed in Section 1 of the text.]]
[[File:YGS_CHR_07_WEST_FIG_03.jpg|thumbnail|Figure 3 Variations in mid-Westphalian A to top Westphalian B palaeo-environments, north–south through eastings 450–460.  
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[[File:YGS_CHR_07_WEST_FIG_03.jpg|thumbnail|Figure 3 Variations in mid-Westphalian A to top Westphalian B palaeo-environments, north–south through eastings 450–460. The vertical axis is the geological succession normalized for regional thickness variations to give a time-equivalent display (see main text): therefore, there is no vertical exaggeration. The horizontal axis is a north–south section through the succession; see Figure 5 for location. The suppression of actual thickness variations allows a more ready assessment of the spatial variations in time-equivalent environments. Note: the unions of coals towards an inferred basin margin northwest of York; the importance of the Top Hard seam group; the general lateral continuity of the named coals; and the persistence of channel belts, evidenced by significant fluvial sandstones, throughout most of the succession. All the named seams are considered to demonstrate some base-level control on their stratigraphical incidence, although their detailed thickness variations and coal types will reflect local control, such as the presence of preceding topographic highs.
 
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[[File:YGS_CHR_07_WEST_FIG_04.jpg|thumbnail|Figure 4 Variations in mid-Westphalian A to top Westphalian B palaeo-environments, north to south through eastings 470– 480. As for [[:File:YGS_CHR_07_WEST_FIG_03.jpg|Figure 3]], the vertical axis is the geological succession normalized for regional thickness variations to give a timeequivalent display (see main text); the horizontal axis is a north–south section through the succession; see [[:File:YGS_CHR_07_WEST_FIG_05.jpg|Figure 5]] for location. Again, the suppression of actual thickness variations allows a more ready assessment of the spatial variations in timeequivalent environments. Note: the unions of coals towards the basin margin southeast of Nottingham; basin-marginal areas where late Westphalian B marine strata occupy a specific condensed succession; the general lateral continuity of the named coals; and the persistence of channel belts, evidenced by significant fluvial sandstones throughout most of the succession. See also the caption for [[:File:YGS_CHR_07_WEST_FIG_03.jpg|Figure 3]].]]
 
[[File:YGS_CHR_07_WEST_FIG_04.jpg|thumbnail|Figure 4 Variations in mid-Westphalian A to top Westphalian B palaeo-environments, north to south through eastings 470– 480. As for [[:File:YGS_CHR_07_WEST_FIG_03.jpg|Figure 3]], the vertical axis is the geological succession normalized for regional thickness variations to give a timeequivalent display (see main text); the horizontal axis is a north–south section through the succession; see [[:File:YGS_CHR_07_WEST_FIG_05.jpg|Figure 5]] for location. Again, the suppression of actual thickness variations allows a more ready assessment of the spatial variations in timeequivalent environments. Note: the unions of coals towards the basin margin southeast of Nottingham; basin-marginal areas where late Westphalian B marine strata occupy a specific condensed succession; the general lateral continuity of the named coals; and the persistence of channel belts, evidenced by significant fluvial sandstones throughout most of the succession. See also the caption for [[:File:YGS_CHR_07_WEST_FIG_03.jpg|Figure 3]].]]

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