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.
Noun. 1. volcanic rock-extrusive igneous rock solidified near or on the surface of the Earth. agglomerate-volcanic rock consisting of large fragments fused together. amygdaloid-volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits.