Rare fractures and a single vein were observed in basalts from Hole 1160A. Fracture + vein density (effectively fracture density since there is only one vein) for Hole 1160A is 20.8/m.
The fracture + vein density in basalts from Hole 1160B ranges from 3.5 to 34.7/m and averages 19.1/m. The vein density ranges from 0 to 17.9/m and averages 7.5/m.
In basalts from Hole 1160B, seven lithologic units were defined based on macroscopic features (see "Hole 1160B" in "Igneous Petrology"). The fracture density for all units is roughly similar (~16 to 18/m), but no veins were identified in the three pillow lava units (Units 1, 5, and 7).