1) blocky silty calcareous rocks, light colored; 2) more indurated, platy arcuate, rocks, light and dark. 3) dark-colored irregular (sub-aerially weathered?) rocks, most jagged and pointy.
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].