Fairly fresh pillow basalts with columnar jointing and thin manganese crust highly angular; some sediment in cracks. Also some obsidian on outer surfaces of pillows.
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].