Fig. 13—Orientation curves for muscovite in “groundmass” of schist No. 4457 from Patearoa, Otago, measured in sections parallel to ab and ac respectively (Turner, 1938, Figs. 2, 3). Angular distance is measured anticlockwise from the positive end of the fabric axis in question. Positions of possible concealed s-surfaces S1 and S3 corresponding respectively to maxima X and Y are shown in inset circle. Fig. 14—Fabric diagram for muscovite (100 flakes) in “groundmass” of No. 4457 measured by Dr. E. Ingerson. Contours 8, 6, 4, 1%; maximum concentration 10% of cleavage poles per 1% area.