Hard sedimentary rock, gray claystones with infilling of gypsum in veins also some crystalline gypsum and anhydrite. Bio element: 7 or 8 pieces of kelp, two or three pieces of massive weathered basalt.
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].