Fine lamination occurs in lake center where gypsum is first precipitated from brines. The sediments contain sand sized, etched and corroded crystals of gypsum, in the subsurface, beneath the zone of fluctuating water levels , pristine crystals occur in a laminated sequence.
Source Roger Suthren
Photograph of a lake centre showing laminated and unlaminated parts of the sequence
Beneath these laminated gypsum coarse twinned crystals of gypsum occur that grew as bottom crusts in the deeper parts of the brine pools (Tucker, 1991).
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