4 S.W. buckets of hand samples 2 large samples in separate bags + several rocks with minimal crusts in dredge bags most are altered basalt substrates with Mn crust ranging from staining to 5 cm in thickness.
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].