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Preservation of Devonian chemotrophic filamentous bacteria in calcite veins

Nigel H. Trewin and Andrew H. Knoll
Preservation of Devonian chemotrophic filamentous bacteria in calcite veins
Palaios (June 1999) 14 (3): 288-294


Filamentous and possible coccoid bacteria are preserved in calcite vein-fills cutting Devonian lacustrine limestones in the Tynet Burn fish bed near Fochabers, N.E. Scotland. Filamentous bacteria grew into open space off the walls of fractures and are concentrated as clumps on some detrital grains. The filaments were coated by iron hydroxide and are now represented by hollow canals 0.3-0.4 mu m diameter enclosed in a sheath of acicular hematite crystals each 2 mu m long by 0.2 mu m broad. Possible coccoid bacteria are represented by hematite spheres 0.5 to 2 mu m diameter. The bacteria grew in cracks formed by deformation of the sediments after initial compaction and formation of calcareous concretions. Fossil fish are preserved in red and purple colors and the surrounding matrix displays a halo of oxidation which is considered to have been bacterially mediated. Bacterial invasion of sediments took place during lowstands of the Middle Devonian Orcadian Lake when the sediment was in the vadose zone. A clear association is seen between the bacteria-bearing veins and reddening of the succession.

ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 14
Serial Issue: 3
Title: Preservation of Devonian chemotrophic filamentous bacteria in calcite veins
Affiliation: University of Aberdeen, Department of Geology and Petroleum Geology, Aberdeen, United Kingdom
Pages: 288-294
Published: 199906
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 23
Accession Number: 1999-049712
Categories: Sedimentary petrologyPaleobotany
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch map
N51°00'00" - N61°10'00", W04°00'00" - E11°00'00"
N54°40'00" - N61°00'00", W08°30'00" - W00°45'00"
Secondary Affiliation: Harvard University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 199917
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