Download e-book for iPad: Aspects of Fluvial Sedimentation in the Lower Triassic by Detlef Mader

Download e-book for iPad: Aspects of Fluvial Sedimentation in the Lower Triassic by Detlef Mader

By Detlef Mader

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

Example text

Rocks at the beach near Old Maid Rock south of Dawlish (Sheet SX 87/97 Newton Abbot, r 96 150, h 76 29 Plate I I 30 llO). 9 : Pebble-strewn layers within thicker sandy intercalations into coarse conglomerate complexes reflect flashy discharge with numerous minor high-energy pulses during more persistent low-water stages that allow migration of transverse sand bars across the inactivated longitudinal gravel bars. The pebble trains mark the onset of separate microcyeles that relate to discrete water surge events.

On the other hand (particularly in the Exraouth Formation), the gravel is frequentl y enriched as lag pockets and veneers within steeper scour pools and Loll holes and shallower erosional hollows on the floor of the channels by trapping of rolling coarse clasts in the depressions during the transport stage prior to deposition. With waning current velocity, the gravelly i n f i l l i n g s of holes and pots become then buried by migrating transverse sand bars or spreading out of sheet sands or are even f i r s t embedded by a l a t e r a l l y extensive sheet-type gravel veneer at the onset of underrunning the threshold velocity for keeping the whole grain population in movement.

Loading of partially consolidated thicker mudstones by thinner sandstones leads to division of sandstone layers into isolated balls and pillows and to downsinking of the fragments into the mud partially associated with convolution. Loading of s t i l l highly water-saturated thinner mudstones by thicker sandstones favours squeezing out of the mud into flame-like features, whereas thicker mudstones tend to equalize the tensions by anticlinal updoming or even diapiric intrusion into the overlying sandstone.

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