Anhydrite in the Detroit River Formation has a 'chicken wire' or mosaic texture, but since thin, contorted layers of limestone do not form complete envelopes, the resulting texture is defined as penemosaic. Insoluble residue studies on 36 samples of anhydrite and gypsum and 47 samples of the interbedded limestone layers and masses from 12 cores provide convincing evidence that the formation texture here is not a replacement phenomenon. Concentration of allogenic quartz in the interbedded limestone layers and masses suggests that they were deposited in a higher energy environment than were the enclosing sulfate rocks, the overlying limestone, or the underlying dolomite. Such an environment could have been produced under sebka conditions or by interruptions of lagoonal sedimentation.

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