Finkelstein et al. (1999) presented an interpretation of lacustrine sediments, particularly the carbonate sediments, in the Oligocene Creede Formation that differs greatly from other recent contributions (Larsen, 1994a; Larsen and Crossey, 1996; Larsen and Smith, 1999). Finkelstein et al. (1999) added much information regarding the depositional conditions in Lake Creede, especially with regard to the biological communities and behavior of sulfur in the lake and sediment. We feel, however, that the following points require clarification: (1) the sources of acid-soluble sulfate, (2) the origin of the calcite pseudomorphs, and (3) physicochemical model for ancient Lake Creede....

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