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Permanent link (DOI): https://doi.org/10.7939/R3Q673

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Neoichnology and Sedimentology of the Fluvial-Tidal Transition Zone of the Columbia River Delta, northwest U.S.A. Open Access

Descriptions

Other title
Subject/Keyword
neoichnology
sedimentology
Columbia River
ichnology
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Dicks, Robynn M
Supervisor and department
Gingras, Murray (Earth and Atmospheric Sciences)
Examining committee member and department
Murray, Alison (Biological Sciences)
Zonneveld, John-Paul (Earth and Atmospheric Sciences)
Pemberton, S. George (Earth and Atmospheric Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2012-04-02T09:51:22Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
The Columbia River Delta, northwest U.S.A., is a complex depositional environment at the mouth of the second largest United States’ river. Through the study of tidal sand bars within the fluvial-tidal transition, neoichnological and sedimentological characteristics of the mixed-energy brackish-water setting were established. Neoichnological analysis determined trace assemblages of the area are consistent with the Teichichnus ichnofacies, with the most intense burrowing found along the bar tops and intertidal zone. Additionally, the ichnogenera burrowing depth, density and burrow diameter decrease moving up-river, and there is larval tidal recruitment of marine trace-makers into the oligohaline zone. Sedimentological analysis of the dataset led to the identification of six facies for the tidal bars of the Columbia River Delta, which were synthesized into one facies association. The more obvious sedimentological tidal indicators are not present in the representative facies and are much more subtle, encompassing changes in flow regime within a single facies.
Language
English
DOI
doi:10.7939/R3Q673
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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