Fig. 3—Vein 4, Quartz. 132 large grains in marginal zones of vein (x and z, Fig. 2A). Contours 6, 4, 2, 0.8%; maximum concentration 6%. Broken line indicates the plane of Vein 4. Fig. 4—Vein 4. Quartz, 52 large grains in marginal zone x. Contours 6, 4, 2%. Broken ares show projection of small circle with centre V and radius 35°. Fig. 5—Vein 4, Quartz, 80 large grains in marginal zone z. Contours 6, 4, 1.2%. Fig. 6—Vein 4, Quartz, 85 small grains in marginal zone x, lying immediately adjacent to medial zone y. Contours 5, 2.4, 1.2%; maximum concentration, 6%. Fig. 7—Vein 4, Quartz, 244 small grains in medial zone y. Contours 3, 2, 1, 0.4%; maximum concentration, 4%. Fig 8—Veins 1 and 3, Quartz. 59 large grains. Contours 6, 3, 1.4%; maximum concentration 7%. Broken line indicates trend of vein-wall; v nearly coincides with the positive end of the a fabric axis.