Abstract

The common nodular habit of anhydrite, similar to the nodular anhydrite in modern Persian Gulf marginal sediments, has played a key role in the interpretation of older evaporite deposits as paleosabkhas. Also, laminated carbonate and sulfate sediments with dark organic interlaminae or films have served as criteria for peritidal or intertidal sedimentation under algal-mat control. Not all laminated sediments originated as algal mats in shallow or intertidal environments, and the nodular habit of anhydrite is a normal diagenetic fabric not indicative exclusively of the subaerial sabkha environment.

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