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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.
Clastic Sedimentary Rocks. The most common set of sedimentary rocks consist of the granular materials that occur in sediment. Sediment mostly consists of surface minerals âquartz and claysâthat are made by the physical breakdown and chemical alteration of rocks.f gravel or pebbles are part of the sediment, the rock that forms is conglomerate. If the rock is broken and recemented together it is called breccia. See examples of all these in the Sedimentary Rock Index. It's worth noting that some rocks commonly lumped in the igneous category are actually sedimentary.