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Banded Calcite Mudstone in the Lower Carboniferous "Reef" Knolls of the Dublin Basin, Ireland
M. E. Philcox
Lower Carboniferous "reef" knolls of the Dublin basin (Waulsortian mudbanks of Lees, 1961) contain a small proportion of banded calcite mudstone which is quite distinct from the "normal" reef sediment. It is confined to cavities of three types. Two of these, the stromatactis and "bryozoa cavities," formed as part of the reef beds, so that the banded mudstone was apparently deposited inside them penecontemporaneously with the "normal" reef sediment which surrounds them. It is suggested that the internal sediment was derived from the "normal" by a filter mechanism.
The third type of cavity are extensive crevices which opened up near the end of the growth of some knolls, probably in response to increased weight of sediment. Considerable dislocation of the original reef structure occurred before final burial by non-reef sediments.
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