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Microorganism-mediated preservation of Planolites, a common trace fossil from the Harkless Formation, Cambrian of Nevada, USA

Ahn, Soo Yeun and Babcock, Loren LU (2012) In Sedimentary Geology 263. p.30-35
Abstract
Specimens of Planolites, a tubular ichnofossil, from the Harkless Formation (Cambrian of Nevada) are commonly rimmed by thin layers of limonite, a probable pseudomorph after pyrite, suggesting that bacterially induced biomineralization played a key role in the preservation of the burrows. Organic material secreted by a vermiform, infaunal tracemaker is inferred to have formed the substrate for a biofilm that facilitated iron sulfide biomineralization by bacteria under localized anaerobic or dysaerobic conditions. Rapid, microbially mediated biomineralization of mucus-lined burrow walls is inferred to have promoted three-dimensional preservation of burrows by strengthening them against sediment compaction, and possibly providing sufficient... (More)
Specimens of Planolites, a tubular ichnofossil, from the Harkless Formation (Cambrian of Nevada) are commonly rimmed by thin layers of limonite, a probable pseudomorph after pyrite, suggesting that bacterially induced biomineralization played a key role in the preservation of the burrows. Organic material secreted by a vermiform, infaunal tracemaker is inferred to have formed the substrate for a biofilm that facilitated iron sulfide biomineralization by bacteria under localized anaerobic or dysaerobic conditions. Rapid, microbially mediated biomineralization of mucus-lined burrow walls is inferred to have promoted three-dimensional preservation of burrows by strengthening them against sediment compaction, and possibly providing sufficient support for burrows to allow time for sediment infill. Decomposition of organic materials in Planolites also left evidence in sediment layers immediately above the burrows: undulose sediment surfaces and small, round, pimpleform gas escape structures. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Trace fossil, Biofilm, Biomineralization, Taphonomy, Cambrian, Nevada
in
Sedimentary Geology
volume
263
pages
30 - 35
publisher
Elsevier
external identifiers
  • wos:000304851400004
  • scopus:84861221350
ISSN
0037-0738
DOI
10.1016/j.sedgeo.2011.08.003
language
English
LU publication?
yes
id
71aba73f-25be-4160-856c-9357955a480d (old id 2895903)
date added to LUP
2012-07-25 17:34:42
date last changed
2017-02-12 03:57:45
@article{71aba73f-25be-4160-856c-9357955a480d,
  abstract     = {Specimens of Planolites, a tubular ichnofossil, from the Harkless Formation (Cambrian of Nevada) are commonly rimmed by thin layers of limonite, a probable pseudomorph after pyrite, suggesting that bacterially induced biomineralization played a key role in the preservation of the burrows. Organic material secreted by a vermiform, infaunal tracemaker is inferred to have formed the substrate for a biofilm that facilitated iron sulfide biomineralization by bacteria under localized anaerobic or dysaerobic conditions. Rapid, microbially mediated biomineralization of mucus-lined burrow walls is inferred to have promoted three-dimensional preservation of burrows by strengthening them against sediment compaction, and possibly providing sufficient support for burrows to allow time for sediment infill. Decomposition of organic materials in Planolites also left evidence in sediment layers immediately above the burrows: undulose sediment surfaces and small, round, pimpleform gas escape structures. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Ahn, Soo Yeun and Babcock, Loren},
  issn         = {0037-0738},
  keyword      = {Trace fossil,Biofilm,Biomineralization,Taphonomy,Cambrian,Nevada},
  language     = {eng},
  pages        = {30--35},
  publisher    = {Elsevier},
  series       = {Sedimentary Geology},
  title        = {Microorganism-mediated preservation of Planolites, a common trace fossil from the Harkless Formation, Cambrian of Nevada, USA},
  url          = {http://dx.doi.org/10.1016/j.sedgeo.2011.08.003},
  volume       = {263},
  year         = {2012},
}