Redoximorphic features in soils of the Triassic Culpeper Basin.

carbon carbone carbono drainage drenaje elemento primario del suelo maryland organic matter oxidoreductions secuencia de suelos soil soil morphological features soil parent materials soil sequences soil temperature soil water regimes sol stratigraphic soil types suelo temperatura del suelo tipos estratificados de suelos topografia topographie topography trait morphologique du sol type de sol stratigraphique