Sedimentary dikes occur in the exposures of the Appin phyllite-limestone along the shore of Loch Leven south of Fort William, western Scotland. Both downward and upward injected dikes are present; the former are probably contemporaneous with deposition of the beds, the latter post-depositional. The dikes are invariably associated with slumped rocks that are typical of unstable marginal geosynclinal areas. The term "cavity filling dikes" suggested by Fairbridge in 1946 is not recommended, but his suggestion that sedimentary dikes are associated with slumped deposits of marginal geosynclinal areas is confirmed.

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