FIGURE 1. Unique assemblage of calcite microbialites, Pavilion Lake, British Columbia.

From the following article:

Modern freshwater microbialite analogues for ancient dendritic reef structures

Bernard Laval, Sherry L. Cady, John C. Pollack, Christopher P. McKay, John S. Bird, John P. Grotzinger, Derek C. Ford and Harry R. Bohm

Nature 407, 626-629(5 October 2000)

doi:10.1038/35036579

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The drawing of the lake shows the position of a ridge, topped by three flat, shallow reefs, that partitions the lake into two basins. Microbialites occur in the southern and northern basins, which have maximum depths of 45 and 65 m, respectively. Inset, side-scan sonar image showing that microbialites (strong signals) occur along the edges of the basins in finger-like fields orientated roughly perpendicular to the shoreline. An unconsolidated calcareous sediment that produces relatively weak sonar returns surrounds the microbialites.

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