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Small mudstone diapirs in multi‐layer Ordovician rocks near Llanwrtyd, Wales, match in anatomy those produced experimentally by Ramberg (1981) and Jackson and Talbot (1989). This appears to be the first record of natural examples at this scale, and they cast light on the relative viscosities of the sediments during early diagenesis.
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Cave et al. (1995) studied this question.
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