A small vein from the Salem limestone [Mississippian] of Indiana was studied in thin section. Spectrographic analyses were made of Foraminifera, limestone with fossils, and a clear and an opaque calcite. Cementation may have occurred by dissolution at points of high compressive strength and reprecipitation at points of low stress; or, organically formed calcite may dissolve with stress as it is less stable, because of high MgO-content, than chemically formed calcite.

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