Control of Basin Symmetry on Fluvial Lithofacies, Camp Rice and Palomas Formations (Plio-Pleistocene), Southern Rio Grande Rift, USA

  1. M. Marzo and
  2. C. Puigdefábregas
  1. G. H. Mack1 and
  2. W. C. James2

Published Online: 14 APR 2009

DOI: 10.1002/9781444303995.ch28

Alluvial Sedimentation

Alluvial Sedimentation

How to Cite

Mack, G. H. and James, W. C. (2009) Control of Basin Symmetry on Fluvial Lithofacies, Camp Rice and Palomas Formations (Plio-Pleistocene), Southern Rio Grande Rift, USA, in Alluvial Sedimentation (eds M. Marzo and C. Puigdefábregas), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303995.ch28

Editor Information

  1. Barcelona, Spain

Author Information

  1. 1

    Department of Geological Sciences, New Mexico State University, Las Cruces, NM 88003, USA

  2. 2

    Department of Geological Sciences, The Ohio State University, 125 South Oval Mall, Colombus, OH 43210, USA

Publication History

  1. Published Online: 14 APR 2009
  2. Published Print: 16 SEP 1993

ISBN Information

Print ISBN: 9780632035458

Online ISBN: 9781444303995

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Keywords:

  • control of basin symmmetry on fluvial lithofacies;
  • formed on a wider alluvial plain;
  • lower percentage of multistorey channel sandstones;
  • significantly higher proportion of floodplain deposits;
  • Palaeosols are laterally continuous and abundant

Summary

Plio-Pleistocene fluvial strata of the Camp Rice and Palomas Formations were deposited in broad, low-sinuosity streams characterized by rapidly shifting channels in turn separated by episodically emergent bedforms and bars. Although the Ancestral Rio Grande was braided throughout the southern rift, important differences exist in channel characteristics, proportion of preserved floodplain strata and associated palaeosol deposits. These differences primarily reflect the influence of basin symmetry on fluvial sedimentation.

Compared to asymmetrical basins, fluvial strata in symmetrical basins: (i) were formed on a wider alluvial plain, (ii) have a much lower percentage of multistorey channel sandstones, (iii) have a significantly higher proportion of floodplain deposits, (iv) are characterized by palaeosols with greater maturity and abundance, and (v) contain channel sandstones with more planar crossbed sets and greater evidence of low-stage bar and bedform modification.