At Site 1160, four rock samples were collected as soon as the core liners were split to characterize the microbial community inhabiting this environment (Table T3). Three are pillow basalt fragments composed of partially altered glass rinds and crystalline basalt interiors (Samples 187-1160B-1W-1 [Piece 3A, 16-18 cm], 4R-1 [Piece 2, 5-10 cm], and 8R-1, 0-87 cm), and one is crystalline basalt (Sample 187-1160B-6R-1 [Piece 18, 102-105 cm]). To sterilize them, the outer surfaces of the rocks were quickly flamed with an acetylene torch, and enrichment cultures and samples for DNA analysis and electron microscope studies were prepared (see "Igneous Rocks" in "Microbiology" in the "Explanatory Notes" chapter).