boulder

Residents at the time described seeing slurry carrying "trees and big boulders", and buildings left deep in sludge and mud.

I feel the rough texture of a boulder, chafing against my fingers.

He felt like a blade of grass caught between two boulders.

A large portion of the wreck was covered with enormous boulders, which had broken away from the cliffs that lined Antikythera’s shore sometime during the two thousand years the wreck had lain on the seabed.

They can be minor, covering roads and driveways with muck, or large and destructive, capable of moving cars at speeds of up to 35 mph and pummeling homes with boulders and a wall of mud.