Part of a microbial carbonate mound, sand-size particles, pastel colored cement, large blobs of microbial carbonate, "T" = thrombolite (non-layered microbial carbonate), "S" = stromatolite (laminated microbial carbonate, which grew upward), "Q" = quartz sand grain, short arrow =ooid, long arrow = way up, Mississippian, North Alabama, thin-section photomicrograph, cross-polarized light, scale 0.5 mm.
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