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Crowded Rosselia socialis in Pleistocene inner shelf deposits; benthic paleoecology during rapid sea-level rise

Masakazu Nara
Crowded Rosselia socialis in Pleistocene inner shelf deposits; benthic paleoecology during rapid sea-level rise
Palaios (June 2002) 17 (3): 268-276

Abstract

Predominant equilibrichnial Rosselia socialis are present at up to thirty stratigraphic levels in middle Pleistocene, siliciclastic inner shelf deposits on the Boso Peninsula, Japan. The ichnofabric composed of R. socialis is interpreted to have formed by a considerably dense population of R. socialis animals (terebellid polychaetes?). The ichnofabric interval represents a transgressive inner shelf deposit strongly affected by a high-frequency, 5th- or 6th-order sea-level rise that probably was rapid enough to influence the ecology of benthic communities. The dense colonization by the R. socialis animals is interpreted to result mainly from rapid transgression caused by short-term sea-level rise. Coastal erosion induced frequent pulses of sedimentation in to the shelfal environment and probably prevented colonization by most benthic animals, except for R. socialis animals, which are thought to be tolerant of such conditions. Ravinement also provided organic detritus, derived mainly from organic-rich coastal deposits of salt-marsh origin, which enabled the detritus-feeding and stress-tolerant R. socialis animals to thrive.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 17
Serial Issue: 3
Title: Crowded Rosselia socialis in Pleistocene inner shelf deposits; benthic paleoecology during rapid sea-level rise
Author(s): Nara, Masakazu
Affiliation: Ehime University, Center for Marine Environmental Studies, Matsuyama, Japan
Pages: 268-276
Published: 20020601
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 48
Accession Number: 2006-027355
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch map
N34°52'00" - N36°07'00", E139°45'00" - E140°52'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200615
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