Although the recovery of sub-basement red paleosoil (or fossil soil) dates back to the 1980’s (e.g., Holmes, 1995), the search for organics preserved in material retrieved from the deep earth’ subsurface has been systematically initiated during the Ocean Drilling Program (ODP) Leg 197 (Emperor Seamounts, north Pacific Transect) (Tarduno et al., 2002). We address the astrobiology-relevant suggestion that preserved organics from extremely deep fossil soils in isolated diagenetic settings makes them a suitable test beds to develop hypotheses for future Deep Earth biosphere research and potential excellent Mars analogs. These soil sequences are rare in geologic collections (review in Holmes, 1995) because they are difficult to access (they are deeply buried -300 to -350 meters below volcanic basement) and sample (only by deep drilling).