Plate 2. Thin-section photomicrographs of upper breccia intervals and overlying sediments from Holes 976B and 976E. 1. Sample 161-976B-72X-1, 2-5 cm. Upper Serravallian, glauconite, foraminifer-rich, coarse lithic-sandstone. Crossed polars. Scale bar = 1 mm. 2. Sample 161-976B-72X-2, 110-113 cm. Detail of similar cemented sandstone as in (1) showing a ghost of foraminifers (F) and euhedral dolomite (D) crystals in a dark clayey matrix. Crossed polars. Scale bar = 200 µm. 3. Sample 161-976B-74R-1, 1-3 cm. nonplanar to planar replacive dolomite (RD) in breccia matrix. Note replacement (arrows) of schist (HGS) clasts by dolomite. Crossed polars. Scale bar = 100 µm. 4. Sample 161-976B-74R-1, 1-3 cm. Detail of (1) showing two generations of replacive dolomite in breccia matrix. Note ghost of foraminifers (F) in the lower right corner. Light rims of dolomite darker grains are dolomite overgrowths. Plane light. Scale bar = 100 µm. 5. Sample 161-976E-16R-1, 113-117 cm. Sediment-filled fissure in fine cataclastic breccia. Note large geopetal infill of larger foraminifers (F), passing upward to laminated internal sediments (LS). Plane light. Scale bar = 1 mm. 6. Sample 161-976E-17R-2, 106-110 cm. Dolomite matrix, cataclastic breccia. Note light euhedral rims of second-generation dolomite bounding darker dolomite fragments (arrows). Note cataclastic breakage and cataclastic flow in quartzite clast (Q) at the right-hand side. Plane light. Scale bar = 500 µm. Click on image for enlargement.

Plate 2. Thin-section photomicrographs of upper breccia intervals and overlying sediments from Holes 976B and 976E. 3. Sample 161-976B-74R-1, 1-3 cm. nonplanar to planar replacive dolomite (RD) in breccia matrix. Note replacement (arrows) of schist (HGS) clasts by dolomite. Crossed polars. Scale bar = 100 µm.