sedimentary (chemical), Mn/Fe oxide crusts and nodules
Anout 110 m rish in depth from NA018-001, fuzzy encrusted, thin, sedimented, about the same size as last sample but not as circular
Cite the IMLGS database as: Curators of Marine and Lacustrine Geological Samples Consortium. The Index to Marine and Lacustrine Geological Samples (IMLGS). National Geophysical Data Center, NOAA. doi:10.7289/V5H41PB8 [date of access].