Oyster shells (large), some small silty calcareous rocks, two larger rock samples one dense limestone (thinner platy piece) another blocky limestone with one pronounced joint and surface coated with manganese. No mud.
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].