Figure F2. SEM microstructure images. A. Hole 1081A at 320 mbsf and 5.8 Ma. A fine-grained clay matrix and a low abundance of calcareous material resulted in darker color and lower reflectance values. B. Hole 1082A at 596 mbsf and 5.6 Ma. A fine-grained matrix of calcareous ooze caused lighter color and higher reflectance values. Note the large foraminifers (calcareous microfossils), which retain intratest porosity to great depths.