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Preferential orientation of shrimp-generated Diplocraterion parallelum and their reliability as paleocurrent indicators

Shahin E. Dashtgard, R. Bruce Ainsworth and James A. MacEachern
Preferential orientation of shrimp-generated Diplocraterion parallelum and their reliability as paleocurrent indicators
Palaios (July 2017) 32 (7): 429-438

Abstract

Arthropods from the late Campanian (Late Cretaceous) of the Western Interior Seaway produced U-shaped Diplocraterion parallelum in mudstones along two closely spaced surfaces (10 cm apart), one of which corresponds to a maximum transgressive surface. Diplocraterion parallelum are widely distributed across both surfaces, with substantial variations in burrow orientations. Based on a comparison of paleocurrent indicators to burrow orientations, we demonstrate that D. parallelum are preferentially oriented parallel to the prevailing fair-weather wave propagation direction (wave-forced currents) that acted upon the colonized surfaces. There is an apparent maximum (34% above uniformity) preferential orientation of the burrows, attributed to the fact that wave-forced currents represent only one of several factors controlling shrimp burrowing behaviors. Based on this study, we propose that in the absence of paleocurrent data, Diplocraterion and other U-shaped burrows can be used to resolve flow directions, and that preferential burrow orientations > or = 2% above uniformity are significant. However, it is noted that it is only possible to resolve 2-way flow directions (trend) from U-shaped burrows, as there is no way to determine vector directions.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 32
Serial Issue: 7
Title: Preferential orientation of shrimp-generated Diplocraterion parallelum and their reliability as paleocurrent indicators
Affiliation: Simon Fraser University, Applied Research in Ichnology and Sedimentology Group, Burnaby, BC, Canada
Pages: 429-438
Published: 201707
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 28
Accession Number: 2017-060911
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch maps
N51°28'00" - N51°28'00", W112°40'00" - W112°40'00"
Secondary Affiliation: University of Adelaide, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201732
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