Analyses of 70 samples of the Ten Mile Creek Dolomite show complete lack of correlation of dolomite/calcite ratios with percent insoluble residue, percent clay minerals, identity of clay minerals, or percent silica. Earlier reports of direct correlations between percent dolomite and percent insoluble residue in some carbonate rocks need not reflect a cause-and-effect relationship between insoluble content and proportion of dolomite. Several reported occurrences of modern dolomite strongly suggest a primary or penecontemporaneous origin independent of quantity or quality of terrigenous detritus. Surely many ancient dolomites similarly reflect an environment of deposition rather than a secondary origin related to the mineralogy of associated clastics.

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