FIGURE 3. Pavilion Lake microbialite morphotypes.
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
a, Shallow-intermediate facies mounds (10–15 m depth;
centimetres to decimetres in diameter) serve as substrates for benthic freshwater
lake flora (charophytes). b, Calcified microbial remains and trapped
sediment comprise 'leaves' of intermediate facies domes (
20 m
deep; decimetres to metres in diameter). c, Cone-shape seepage structures
with hollow internal conduits that open at the tops of the cones on the intermediate
depth microbialites (20–30 m; decimetres to metres in diameter).
d, Relatively dense calcite leaves of deep water mounds (> 30 m;
centimetres to metres in diameter) display unique dendritic microstructure.