One of the issues of the AAPG Bulletin (v. 90, no. 11) was concerned with “hydrothermal dolomite reservoirs,” specifically “hydrothermal dolomite fields” (Davies and Smith, 2006). The term “hydrothermal dolomite” is confusing and meaningless (Machel and Lonnee, 2002). To study the origin of dolomite and its hydrothermal depositional setting, I examined modern settings, including the Mediterranean Sea (Friedman, 1991) (Figure 1). The shallow-water facies in this modern setting consists of dolomite and gypsum. The rocks range from almost pure gypsum to pure tough dolostone so thoroughly cemented that sampling required hammer and...

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