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A novel contemporary fluvial ichnocoenose; unionid bivalves and the Scoyenia-Mermia ichnofacies transition

Andrew M. W. Lawfield and Ron K. Pickerill
A novel contemporary fluvial ichnocoenose; unionid bivalves and the Scoyenia-Mermia ichnofacies transition
Palaios (August 2006) 21 (4): 391-396

Abstract

A transitional Scoyenia-Mermia ichnocoenose from the Saint John River, Fredericton, New Brunswick, Canada, is dominated by elements of the Mermia ichnofacies, with traces comparable to Curvolithus, Helminthopsis, Gordia, Spirophycus, and LOCKEIA: Environmental characteristics are, however, more typical of the Scoyenia ichnofacies, with an emersion event providing conditions favorable to viewing traces preserved in a sand-softground substrate. Observation of in situ trace-making behavior allowed traces to be attributed to their progenitors, which include unionid and sphaeriid bivalves. An omission assemblage of vertebrate tracks also was present, comprising gull, raven, and mink. Oichnus-like borings were observed in some unionid shells. The shallow-tier trace assemblage created in a high-energy river channel may be expected to have a poor preservational potential, with loss of trace definition observed at the water margin during emersion and subsequent deterioration by eolian sediment transport.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 21
Serial Issue: 4
Title: A novel contemporary fluvial ichnocoenose; unionid bivalves and the Scoyenia-Mermia ichnofacies transition
Affiliation: University of New Brunswick, Department of Geology, Fredericton, NB, Canada
Pages: 391-396
Published: 200608
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 42
Accession Number: 2006-071562
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N45°57'00" - N45°57'00", W66°40'00" - W66°40'00"
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: 200641
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