It has a mix of clay-sized & silt-sized particles. It is a silicic-clastic sedimentary rock. It is found in every region of the world and under the earth crust where natural gas and oil reservoirs are found.

Where do you find mudstones?

Mudstone is made up of fine-grained clay particles (<0.05mm) compressed together. Mudstones form where clay has settled out in calm water - in lakes, lagoons, or deep sea.

Where do conglomerates form?

Conglomerate-Forming Environment: A beach where strong waves have deposited rounded, cobble-size rocks. If buried and lithified, these materials might be transformed into a conglomerate.