What Can Turn Pebbles And Sand (Sediment) Into A Conglomerate (Sedimentary Rock)?. Most important cements in sedimentary rocks:. For example, a conglomerate rock formed near a river may contain large quartz pebbles, while one found in a coastal setting might include more diverse mineral content.

For example, a conglomerate rock formed near a river may contain large quartz pebbles, while one found in a coastal setting might include more diverse mineral content. This process turns rock into magma, not a conglomerate. This process turns sediment into metamorphic rock, not a conglomerate.