Moodies Group, Microbial Mats
Living reference work entry
The Middle Archean Moodies Group (~3.22 Ga, Barberton Greenstone Belt, South Africa), Earth’s oldest known well-preserved shallow-water siliciclastic sequence, includes several units with common microbial mats which thrived in the photic zone of a tidally influenced shoreline. The fossil mats are preserved as kerogenous laminations up to 1 mm thick, are interbedded with medium- to coarse-grained sandstones and rare gravel beds (Fig. 1), and were early silicified. SEM observations of the laminae show interwoven and bundled microbial filaments (1–3 μm in diameter), confirming mat biogenicity.
KeywordsGreenstone Belt Filamentous Cyanobacterium Phototactic Behavior Moodies Group Filamentous Organism
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© Springer-Verlag Berlin Heidelberg 2014