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- W2060939625 abstract "ABSTRACT Field examination of the Carboniferous Limestone at Nant y Gamar, southeast of Llandudno on the coast of North Wales, indicates that fenestrate bryozoa are the major organic components of a shoal or knoll-like structure in limestone of S2 age. The limestone is a bryozoan calcilutite consisting of large, intact or occasionally broken fenestrate Bryozoa in a matrix of dark brown microcrystalline calcite containing fine grained crinoid and brachiopod fragments, Foraminifera and calcispheres (Biomicrudite, Folk, 1959). The bryozoan limestone is flanked by crinoidal calcirudites, slightly quartzose bioclastic calcarenites with matrices of microcrystalline calcite (respectively Biomicrudite and Biomicrite, Folk, 1959), and intraclastic calcirudites with calcite cement (Intrasparudite, Folk, 1959). In view of the structure and lateral variation of facies, it is tentatively proposed that the bryozoan rock unit represents a shoal or possibly a fore-reef deposit of a small reef-knoll. The bryozoa do not appear to be in a growth position, or to form a rigid framework, but seem to represent a loose mesh of zoaria derived by transportation or scavenging action. It is assumed that they were continually derived from a nearby reef or broken in situ, and entrapped sediment transported by currents in shallow water, thus forming a prominence. The prominence grew by accumulation, and resulted in a shoal or knoll-like structure." @default.
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- W2060939625 date "1965-01-01" @default.
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- W2060939625 title "Petrology of a Lower Carboniferous Bryozoan Limestone and Adjacent Limestones in North Wales, Great Britain" @default.
- W2060939625 doi "https://doi.org/10.1306/74d71398-2b21-11d7-8648000102c1865d" @default.
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