Figure F63. Distribution and abundance of secondary minerals as well as other alteration features in Hole 1137A vs. depth (mbsf), based on macroscopic features and mineral occurrences we observed in hand specimen from the core. The color is the hue of the bulk rock; dark gray = the least-altered basalts. The breccia column shows the distribution of clastic flow tops and flow bottoms. Horizontal dashed lines = unit boundaries. Colors: Bl = blue green, Gn = green, G = dark gray, Pk = pink brown, Bl = black, R = red. Alteration: f = fresh, s = slight, m = moderate, h = high, c = complete. Sediments: Bl = blue-green well-indurated sediments, S = sandstone, C = conglomerate, B = baked sediments, V = crystal vitric tuff, Bx = volcanic breccia. Abundance: 0 = absent, t = trace, c = common, a = abundant. AmSi = amorphous silica, CaCO₃ = calcium carbonate.