Figure F2. Photomicrographs of the lower Oligocene to middle Miocene sediments from Site 1132. Scale bars = 0.1 mm. A. Bioclastic grainstone composed of a variety of bioclasts. Some coarse sparry calcite cements (C), rarely showing a poikilotopic texture, are observed. The sediments are slightly dolomitized, containing clear euhedral dolomite rhombs (arrow), 10-50 µm in size (Unit IV; Sample 182-1132C-13R-CC, 10-13 cm; dolomite content = 21 wt%). B. Densely dolomitized bioclastic grainstone. Clear euhedral dolomite crystals, ranging from 10 to 50 µm in size, are scattered throughout, and an idiotopic to hypidiotopic mosaic texture is observed in the densely dolomitized part (Unit IV; Sample 182-1132C-21R-CC, 12-14 cm; dolomite content = 91 wt%). C. Foraminiferal grainstone. Particles are dominated by benthic (B) and planktonic (P) foraminifers and echinoid fragments (E). Some of benthic foraminifers are black stained. Calcite cementation and dolomitization are very rare (Unit V; Sample 182-1132C-28R-CC, 0-3 cm; dolomite content = 1 wt%). D. Bioclastic packstone from the basal part of Unit V. The packstone consists mainly of bioclasts, planktonic foraminifers (P), and benthic foraminifers (B) with rare pyrite (Py). The sediments are slightly dolomitized, and the dolomite crystals (D) are clear, euhedral, and 100-200 µm in diameter (Unit V; Sample 182-1132C-30R-CC, 0-3 cm; dolomite content = 8 wt%).

Figure F2. Photomicrographs of the lower Oligocene to middle Miocene sediments from Site 1132. Scale bars = 0.1 mm. A. Bioclastic grainstone composed of a variety of bioclasts. Some coarse sparry calcite cements (C), rarely showing a poikilotopic texture, are observed. The sediments are slightly dolomitized, containing clear euhedral dolomite rhombs (arrow), 10-50 µm in size (Unit IV; Sample 182-1132C-13R-CC, 10-13 cm; dolomite content = 21 wt%). B. Densely dolomitized bioclastic grainstone. Clear euhedral dolomite crystals, ranging from 10 to 50 µm in size, are scattered throughout, and an idiotopic to hypidiotopic mosaic texture is observed in the densely dolomitized part (Unit IV; Sample 182-1132C-21R-CC, 12-14 cm; dolomite content = 91 wt%). C. Foraminiferal grainstone. Particles are dominated by benthic (B) and planktonic (P) foraminifers and echinoid fragments (E). Some of benthic foraminifers are black stained. Calcite cementation and dolomitization are very rare (Unit V; Sample 182-1132C-28R-CC, 0-3 cm; dolomite content = 1 wt%). D. Bioclastic packstone from the basal part of Unit V. The packstone consists mainly of bioclasts, planktonic foraminifers (P), and benthic foraminifers (B) with rare pyrite (Py). The sediments are slightly dolomitized, and the dolomite crystals (D) are clear, euhedral, and 100-200 µm in diameter (Unit V; Sample 182-1132C-30R-CC, 0-3 cm; dolomite content = 8 wt%).