File:YGS CHR 07 WEST FIG 03.jpg
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Summary
| description | English: 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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| source | Yorkshire Geological Society | |
| author | J. H. Rippon |
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