Figure F37. Color close-up photograph of Sample 183-1142A-9R-4 (Piece 1, 0-13 cm). A possible example of a glassy pillow margin with large calcite vein oriented parallel to dark green alteration zone and intersecting smaller calcite veins at approximately right angles. This is identical to the features observed in fresh glassy pillow margins in Hole 1140A. Thin-section examination of this feature, however, reveals that grain size does not decrease toward the highly altered margins, an observation that does not support the argument that these features are altered glassy pillow margins.