Please note that the schools of literary criticism and their explanations included here are by no means the only ways of distinguishing these separate areas of theory. Indeed, many critics use tools from two or more schools in their work.
Conglomerate is a clastic sedimentary rock that contains large (greater than two millimeters in diameter) rounded clasts.
Coal-a sedimentary rock formed from organic matter. Conglomerate-a sedimentary rock composed of large rounded fragments of other rocks. Coquina-a sedimentary carbonate rock formed by accumulation of abundant shell fossils and fragments.