10 manganese nodules the size of baseballs plus several smaller nodules 4 large flat rocks and several smaller rocks containing radiolarian ooze, thin layers of silica, manganese and pyrolusite dendrites.
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].