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Extra resources for Aspects of Fluvial Sedimentation in the Lower Triassic Buntsandstein of Europe
Abt. 8 m. Rocks at the cliffs between Sandy Beach and Straight Point southsoutheast of Littleham (Sheet SY 08/18 Sidmouth, r 03 580, h 79 800 to r 03 700, h 79 510). 11 : Aerial view of the outcrop belt along the coast of South Devon. The Permian and Triassic red beds are exposed in vertical cliffs and horizontal sections and are accessible at low tide. Section between Straight Point (left) and Otter Cove southeast of Littleham (Sheet SY 08/18 Sidmouth). C. Laming (Exeter). 12 : Dewatering features in gravelly alluvial-fan sediments comprise injection of mobilized sand from below into loose gravel soon after deposition.
The mudstones are dark red to red v i o l e t , horizontal-laminated and mainly free of sand in both layered and dispersed form. In minor amounts, mudstone beds are also low-angle large-scale cross-stratified or ripple-laminated and contain isolated to numerous lenticular streaks and sheet-like laminae of fine to very fine sand. Dispersion of sand within blocky to massive mudstones is associated with slight to moderate, occasionally also strong bioturbation in some beds. The homogeneous mudstones are predominantly of layered to blocky appearance with alternating finer and coarser lamination due to probably changing clay tenacities.
2. Mudstones Mudstoaes occurring as intercalations into the aeolian sands reach in thickness between a few mm and some dm and can be of different origin. Apart from f l u v i a l overbank plain and open lacustrine silty-clayey sediments, mudstones form in restricted interdune playa lakes between the dune ridges of various spacing. The interdune mudstones are mainly encased in thicker aeolian sequences lacking intervening f l u vial sands and are horizontal-laminated. They are frequently associated with damp to wet interdune sands being characterized by wavy and undulating horizontal-lamination and alternating sandy and silty-clayey layers of some mm to a few cm thickness.
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