Initial Reports Volume 187 Chapter 3, Table T4. 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 (Fe/S) or manganese redox cycles; SEM = scanning electron microscope; TEM = transmission electron microscopy; X = sample prepared on board. Depth Enrichment cultures DNA analysis SEM/TEM samples Core (mbsf) Sample type Anaerobic Aerobic Microcosm* Wash Fixed Fixed Air dried 187-1152A- 1R 0.0-11.2 Rock 3 3 1 Fe/S X X X X 187-1152B- 4R 35.8-40.8 Rock 10 3 X X X