What rock type would be made mostly from particles 0.5 to 2.0 millimetres with a few larger rounded grains 4 mm in size?

Question

What rock type would be made mostly from particles 0.5 to 2.0 millimetres with a few larger rounded grains >4 mm in size?

Quizplus · Accepted Answer

Pebbly sandstone is a rock type that is made up of mostly sand-sized particles (0.5-2.0 mm) with a few larger rounded grains (>4 mm). This description matches the given characteristics of the rock type in question. Conglomeratic mudstone would be made up of larger particles (>2 mm) held together by a mud matrix. Granular shale would have a clay or silt-sized particle size and not have any larger grains present. Fred Flintstone is not a rock type but a fictional character from a TV show.

What Rock Type Would Be Made Mostly from Particles 0