Aspects of Fluvial Sedimentation in the Lower Triassic by Detlef Mader

By Detlef Mader

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Additional info for Aspects of Fluvial Sedimentation in the Lower Triassic Buntsandstein of Europe

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Plate II/12), desiccation cracks (cf. Plate I/4), downsinking of sand lenses and fragments, and intrusion of mud° Erosional features at the base of breccias overlying finer interbeds comprising isolated steep scour pools and kelk holes with p a r t i a l l y overhanging walls (cf. Plate 1/11), smaller and larger flute casts and l i t t l e channels cutting down into the substrate. Interbedded sandy and silty-clayey sediments are often also characterized by bleaching of isolated sand bands and dykes.

In parts of the sequence containing exotic gravel, some clasts are in places enriched at the erosional boundaries and are either round to originally angular or of sand-blasted ventifact shape. Ventifacts are of particular palaeuenvironmental significance in the Budleigh Salterton Pebble Beds. Within the wholly f l u v i a l conglomerate succession consisting of well-rounded gravel, some reworked ventifacts are dispersed. At the top of the Budleigh Salterton Pebble Beds, sand-blasted gravel is concentrated in a l a t e r a l l y extensive ventifact layer, and someof the dreikanter pebbles are also covered with desert varnish.

Abt. 3 m. For locality of. Plate If/2. IO : Intercalated silty-clayey and fine sandy low-water waning drapes within fluvial channel sands are cut back with respect to their original distribution by subsequent erosion. The origin of steep, partially overhanging flanks documents the consolidation of the veneers forming at the turning point between successive floods due to dewatering during desiccation of parts of the stream floor during extremely low water level. Upper Permian, Exmouth Formation.

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