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- W2094630911 abstract "Abstract The marine, Lower Permian Vryheid Formation contains a distinctive macrobedform suite. This comprises giant crossbeds up to 12 m thick (large dunes), masterbedded units up to 15 m thick (giant dunes), stacked masterbedded units 40 m thick (supergiant dunes) and a shelf stratigraphy up to 100 m thick. Tidal currents, augmented by an oceanic current, were responsible for bedform migration. Two categories of giant dunes are noted: (1) a fine-grained-type (associated with tidalites and tempestites) which forms a sheet sandstones, and (2) a coarse-grained-type (associated with tidalites) which occurs as discrete pods. It is suggested that the distal fine-grained-type formed in a setting exposed to oceanic storms whereas the proximal coarse-grained-type developed in a sheltered setting. With migration into more open areas the coarse-grained-type could develop into the fine-grained-type. It is further suggested that the giant dunes climbed to form supergiant dunes up to 40 m thick. The supergiant dunes are further stacked into stratigraphic units 40–100 m thick which may be due to supergiant dune climbing, or possibly tectonic effects, to produce a regressive shelf sequence." @default.
- W2094630911 created "2016-06-24" @default.
- W2094630911 creator A5027689799 @default.
- W2094630911 date "1992-05-01" @default.
- W2094630911 modified "2023-09-27" @default.
- W2094630911 title "Subaqueous giant (15 m) and supergiant (40 m) dunes from the Lower Permian Vryheid Formation of the Karoo Supergroup, northern Natal, South Africa" @default.
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- W2094630911 doi "https://doi.org/10.1016/0037-0738(92)90127-d" @default.
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