By Detlef Mader
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Extra info for Aspects of Fluvial Sedimentation in the Lower Triassic Buntsandstein of Europe
The subordinate occurrence of gravel within the mainly sandy successions t e s t i fies both restricted to supply of coarse material from the source area and to limited periods of sufficient discharge rates to enable transport of these fractions. 1~2. 1. Sedimentary structures and depositional processes The sandstones which build up most of the f l u v i a l braidplain deposits in the Permian and Triassic of South Devon mainly originate as transverse bars and plane sheets on the bottom of channels of a moderately- to weakly-braided river system under conditions of high-intensity lower-flow regime and upper current energy.
5 m. For locality cf. Plate II/1. wards direction (cf. Plate I I / 6 ) . Areal surveys of thicker sandstone intercalations into the mudstones show several d i s t i n c t populations of beds with lateral persistence of some tens of metres, several hundreds of metres and a few kilometres, respectively. The sandstone beds which are thinning insidewards direction comprise both depositional lenses of sheet-type origin which are laid down in l a t e r a l l y declining thickness and erosional channels which cut with gently to moderately sloping margins into the mudstones and are i n f i l l e d by sand.
1. Coarse conglomerates The coarse conglomerates in the Budleigh Salterton Pebble Beds (cf. Plates II/2, II/5 and If/9) form in watercourses of a highly-braided river system consisting of numerous narrowly-spaced low-sinuosity channels that enclose only l i t t l e overbank wedges and which shift rapidly in lateral direction. The conglomerates are laid down as shallow longitudinal bars or sheets on the floor of the streams under conditions of high-energy discharge. Considerable r e l i e f in the source area, steep palaeoslope gradients and high precipitation rates favour supply of large amounts of coarse detritus along with finer material.
Aspects of Fluvial Sedimentation in the Lower Triassic Buntsandstein of Europe by Detlef Mader