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GEOREF RECORD

Tubey or not tubey; death beds of Ediacaran macrofossils or microbially induced sedimentary structures?

Lyle L. Nelson and Emily F. Smith
Tubey or not tubey; death beds of Ediacaran macrofossils or microbially induced sedimentary structures?
Geology (Boulder) (August 2019) 47 (10): 909-913

Abstract

Within the upper Ediacaran Esmeralda Member of the Deep Spring Formation in southeastern California, USA, an approximately 3 m stratigraphic interval contains multiple clastic bedding surfaces with enigmatic, three-dimensionally preserved corrugated tubes (<60 cm in length and 6 cm in width). When viewed as fragments and in situ on bedding planes, these resemble larger versions of annulated, tubular soft-bodied macrofossils that are common in late Ediacaran biotic assemblages regionally and globally. Despite superficial similarities to casts and molds of body fossils preserved in correlative strata, we suggest these tubes are instead previously undescribed organosedimentary structures that developed through differential compaction of rippled heterolithic interbeds bound by pyritized microbial mat layers. These distinctive structures formed within peritidal settings in the latest Ediacaran Period as the result of specific ecological and environmental conditions marked by flourishing microbial mat communities and dysoxic sediments. This interpretation may inform the biogenicity of other structures previously reported as macroscopic body or trace fossils.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 10
Title: Tubey or not tubey; death beds of Ediacaran macrofossils or microbially induced sedimentary structures?
Affiliation: Johns Hopkins University, Department of Earth and Planetary Sciences, Baltimore, MD, United States
Pages: 909-913
Published: 20190812
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 36
Accession Number: 2019-081261
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019324
Illustration Description: illus. incl. strat. col.
N35°45'00" - N37°30'00", W118°45'00" - W115°40'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201943
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