Descending Tabular Cross-Bed Sets and Bounding Surfaces from a Fluvial Channel in the Upper Carboniferous Coalfield of North-East England

  1. J. D. Collinson and
  2. J. Lewin
  1. R. S. Haszeldine

Published Online: 29 APR 2009

DOI: 10.1002/9781444303773.ch36

Modern and Ancient Fluvial Systems

Modern and Ancient Fluvial Systems

How to Cite

Haszeldine, R. S. (1983) Descending Tabular Cross-Bed Sets and Bounding Surfaces from a Fluvial Channel in the Upper Carboniferous Coalfield of North-East England, in Modern and Ancient Fluvial Systems (eds J. D. Collinson and J. Lewin), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303773.ch36

Author Information

  1. Department of Applied Geology, Strathclyde University, Glasgow G1 1XJ, UK

  1. Britoil, 150 St Vincent Street, Glasgow G2 5LJ, UK

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 7 FEB 1983

ISBN Information

Print ISBN: 9780632009978

Online ISBN: 9781444303773

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Keywords:

  • descending tabular cross-bed sets and bounding surfaces from fluvial channel – upper carboniferous coalfield of north-east England;
  • tabular sets;
  • bounding surfaces;
  • cross-bedding;
  • tangential forests

Summary

The internal structure of an elongate sandbody 1.9 km across and 10 m thick is dominated by sequences of tabular cross-bed sets: trough sets are less common. Tabular sets have avalanche faces and occur as downcurrent-descending tiers within larger cosets. The sets were deposited by sandsheet bedforms and were components of larger sandwave bedforms (which now form cosets). Sandwaves descended the low-angled leeside of an ever larger slow-moving bar. Facies of cross-bedding are defined from set and coset types. Analogies with modern fluvial bars suggest that the 10 m thick sandstone was deposited as part of one large fluvial bar. Similar configurations of sets are known from the leesides of other large fluvial, tidal shelf and aeolian bedforms.

A spectrum of different types of bounding surfaces separate sets and cosets. These originated when sandsheets migrated straight down, or diagonally down the lee faces of sandwaves. Such migration was probably influenced by the crestline shape of the larger sandwave bedform rather than by river flow stage.