German Mueller, Georg Irion; 'Salt-biscuits'; a special growth structure of NaCl in salt sediments of the Tuz Goelue ('Salt Lake'), Turkey. Journal of Sedimentary Research ; 39 (4): 1604–1607. doi: https://doi.org/10.2110/39.4.1604
Biscuit-shaped NaCl disks are the main constituents of a special sediment type in evaporating Tuz Golu. Their origin can be observed directly: thin salt flakes grow in the surface water layer of the basin and settle down. After deposition they continue growing in all directions, larger NaCl crystals developing at the bottom, smaller ones on the top of the disks.