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Erosional surfaces in the Upper Cretaceous Castlegate Sandstone (Utah, USA): Sequence boundaries or autogenic scour from backwater hydrodynamics?

Trower, Elizabeth J. and Ganti, Vamsi and Fischer, Woodward W. and Lamb, Michael P. (2018) Erosional surfaces in the Upper Cretaceous Castlegate Sandstone (Utah, USA): Sequence boundaries or autogenic scour from backwater hydrodynamics? Geology, 46 (8). pp. 707-710. ISSN 0091-7613. https://resolver.caltech.edu/CaltechAUTHORS:20180713-160705385

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Abstract

Sequence stratigraphy relies on the identification of unconformity-bound sedimentary packages in order to understand variations in sediment supply, subsidence, and eustasy, which are themselves controlled by external (allogenic) drivers such as climate and tectonics. However, intrinsic (autogenic) river dynamics can also create a rich stratigraphic architecture in the absence of allogenic changes. Here, we outline scaling relationships for the expected depth and length scales of autogenic scour resulting from non-uniform flows in coastal rivers, and apply these relationships to the Upper Cretaceous Castlegate Sandstone—a classic fluvial sandstone unit in the Book Cliffs of Utah (USA). Theoretical and experimental work suggests that hydrodynamics within the backwater reach of coastal rivers—the zone of non-uniform flow that extends upstream of the river mouth—causes spatially extensive erosion during floods; this in turn creates erosional surfaces within fluvio-deltaic stratigraphy that may appear similar to sequence boundaries. Results demonstrate that scour patterns within the Castlegate Sandstone are consistent with the predictions of backwater-induced scours, and show how allogenic versus autogenic erosional surfaces can be parsed within fluvio-deltaic stratigraphy.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1130/G40273.1DOIArticle
ORCID:
AuthorORCID
Fischer, Woodward W.0000-0002-8836-3054
Lamb, Michael P.0000-0002-5701-0504
Additional Information:© 2018 Geological Society of America. Manuscript received 14 March 2018; Revised manuscript received 28 June 2018; Manuscript accepted 1 July 2018. We thank E. Hajek and J. Bhattacharya for constructive reviews. This work was supported by the Caltech Terrestrial Hazard Observation and Reporting program (to Lamb and Fischer) and National Science Foundation grant 1427177 to Lamb. Trower and Ganti received support from an Agouron Institute Geobiology Postdoctoral Fellowship and Imperial College London’s Junior Research Fellowship, respectively. Fischer acknowledges the support of the David and Lucile Packard Foundation.
Funders:
Funding AgencyGrant Number
Terrestrial Hazards Observation and Reporting CenterUNSPECIFIED
NSFEAR-1427177
Agouron InstituteUNSPECIFIED
Imperial College LondonUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:20180713-160705385
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180713-160705385
Official Citation:Elizabeth J. Trower, Vamsi Ganti, Woodward W. Fischer, Michael P. Lamb; Erosional surfaces in the Upper Cretaceous Castlegate Sandstone (Utah, USA): Sequence boundaries or autogenic scour from backwater hydrodynamics?. Geology ; 46 (8): 707–710. doi: https://doi.org/10.1130/G40273.1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87856
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jul 2018 23:23
Last Modified:03 Oct 2019 20:00

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