Saturday, January 23, 2021




A small chunk of microcrystalline limestone (a peloid, "P") coated with a thin layer of oolitic calcite, and a small piece of a mollusk shell ("M") with a similar coating, in a small patch of grainstone in a former hole in a microbial reef. Thin-section photomicrograph, Mississippian, North Alabama, image 1 mm wide.

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