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The Evaporite Member of the Kirmir Formation was deposited in shallow lacustrine environments during the upper Miocene. The most soluble minerals of this member can be currently observed in the Cayirhan mine. The Evaporite Member, which is composed of secondary gypsum at outcrop, can be subdivided into a bedded lower unit and a massive upper unit. In the bedded lower unit, most of the gypsum throughout...
Permian red beds and evaporites in the midcontinent of the United States were formed and altered under the influence of extremely acidic (some with pH<1) lake waters and groundwaters. Based upon geologic, geochemical, and biogeological data, as well as comparison of these Permian rocks with modern acid lake systems in Australia, we propose criteria for the recognition of the products of acid deposition...
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