Plate 3. Thin-section photomicrographs of cataclasites from Hole 899B, all under plane-polarized light. Scale bar = 1 mm. 1. Sample 149-899B-27R-1, 40–45 cm. Deformational stage D serpentinite mylonite. Note the serpentine -type porphyroclast and the serpentine fibers (parallel to top of photograph) that have grown parallel to shear. Arrows indicate the apparent shear sense. Blanks are voids produced during thin-section processing. 2. Sample 149-899B-29R-1, 82–84 cm. Serpentinite cataclasite showing two breccia generations. Phase F₁ breccia (early breccia) consists of serpentine clasts and serpentine matrix. Phase F₂ breccia consists of phase F₁ breccia clast and serpentine-calcite matrix. 3. Sample 149-899B-29R-1, 73-76 cm. Calcite vein (phase F₃) cross-cutting phase F₁ and F₂ breccias. 4. Sample 149-899B-19R-2, 37-42 cm. Foliated ultracataclasite (deformational stage D) fragment within phase F₁ breccia. 5. Sample 149-899B-29R-1, 82-84 cm. Deformational phase F₁. Broken porphyroclast consisting of serpentine and opaque mineral (magnetite?) surrounded by vague cataclastic foliation (S). All of the matrix is serpentine. Note the open crack in the porphyroclast filled by matrix. 6. Sample 149-899B-29R-1, 43–48 cm. Porphyroclasts broken during the F₁ deformational phase. Note the different degrees of single porphyroclast breakages. Compare with Plate 4, Figures 4–6.