General: Over 10 inches; in common usage, a boulder is too large for a person to move
ReferencesEncyclopedia of Life
Tree of Life
World Register of Marine Species
National Center for Biotechnology Information
Citation: boulder (unknown) Deep-Sea Guide (DSG) at http://dsg/mbari.org/dsg/view/concept/boulder. Monterey Bay Aquarium Research Institute (MBARI). Consulted on 2022-08-19.