involved rock

Many past demonstrations have involved rock throwing and tire burning, especially at key intersections in the city of Niamey.

There were several reported cases where SUNTRACS, a workers union, was angered, causing several riots which involved rock flinging.

Also unlike the rest of the North American Cordillera, deformation in the Maria Fold and Thrust Belt involved rocks of the North American Craton, most notably the Grand Canyon sequence of sedimentary rocks.