Initial Reports Volume 187 Chapter 12, Table T3. Rock samples incubated for enrichment cultures and prepared for DNA analysis and electron microscope studies and microspheres evaluated for contamination studies. Notes: * = microcosm for iron and sulfur or manganese (Mn) redox cycles; SEM = scanning electron microscope; TEM = transmission electron microscopy; X = samples prepared on board. Depth Sample Enrichment cultures DNA analysis SEM/TEM samples Core (mbsf) type Anaerobic Aerobic Microcosm* High pressure Wash Fixed Fixed Air dried 187-1161A- 3R 120.0-129.4 Chilled margin 8 3 X X X X X 4R 129.4-138.8 Breccia 8 3 1 Mn X X X X X