gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1981.44.333.17 Short Communications On Calcic Dolomite-Ankerite from the Kimmeridge Clay Irwin Hilary Sedimentary Research Laboratory, Department of Geology, University of Reading, Whiteknights, Reading RG6 2AB 3 1981 44 333 105 107 27 5 1980 11 9 1980 Copyright © 1981, The Mineralogical Society 1981