Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks.
On June 8, 2020, protesters occupied the park and declared it part of the Capitol Hill Autonomous Zone (CHAZ). The area was renamed the Capitol Hill Occupied Protest (CHOP) several days later.