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Institute of Geological Sciences, Ring Road Halton, Leeds LS15 8TQ;
* Institute of Geological Sciences, Exhibition Road, London SW7 2DE;
Chelsea College of Science, Manresa Road, London SW3 6LX.
The distribution of mudrocks in the British Carboniferous is largely related to the underlying block/basin structure, the basins showing mainly muddy sequences. Most mudrocks are in the Upper Carboniferous Coal Measures, where they form more than 500f the sequence. Average chemical analyses and mineralogical compositions of fireclays mainly from the Upper Carboniferous are given and compared with international averages; the Phanerozoic secular variation of CaO/MgO ratios resembles Russian results.
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