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Tillite is a lithified till (poorly sorted glacial debris) which may be called a matrix-supported conglomerate if there are enough granules, pebbles, cobbles, and boulders present. At least 30% of the rock should be composed of clasts larger than 2 mm in diameter in order to call that rock a true conglomerate.Conglomerate from the Ordovician near Bergen in Norway. The clasts are made of quartzite and are slightly flattened due to metamorphism.onglomerate is composed of clasts larger than 2 mm which is the upper limit of sand grains size. Conglomerates are differentiated from sedimentary breccias which are composed of angular clasts.
Geologists use the word clasts to denote particles of all these kinds, and rocks made of clasts are called clastic rocks. Look around you at where the world's clastic sediment goes: sand and mud are carried down rivers to the sea, mostly. Sand is made of quartz, and mud is made of clay minerals. As these sediments are steadily buried over geologic time, they get packed together under pressure and low heat, not much more than 100 C.