The answer is conglomerate.
Clastic sedimentary rocks such as Breccia, conglomerate, sandstone, and shale are formed from mechanical weathering debris. Chemical sedimentary rocks, such as rock salt, iron ore, chert, flint, some dolomities, and some limestones, form when dissolved materials precipitate from solution. Conglomerate is a coarse-grained clastic sedimentary rock that is composed of a substantial fraction of rounded to subangular gravel-size clasts, e.g granules, pebbles, cobbles, larger than 2mm in diameter.
