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The AAPG/Datapages Combined Publications Database
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Samples of grey-buff, hard and brittle, cryptocrystalline evaporitic dolomite from the Charles Formation of southern Saskatchewan have an average ^dgrO18 value of +0.64 per mil relative to the PDB standard. Compared to normal marine calcite limestones of the same age (^dgrO18 = -6.21, standard deviation = 0.89%), the dolomite is depleted in O16 to the extent of 6.85 per mil. This result does not preclude a primary chemical origin for the dolomite as do the isotopic data of Degens and Epstein (Geochim. Cosmochim. Acta, 28, 23, 1964).
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