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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.
Sediments consist of: 1  Detritus: Detritus is fragmental material resulting from the break down of other rocks through the process of weathering. 2  Although we casually use the term erosion to refer to the breakdown of rocks, erosion is technically part of a series of processes that begins with weathering.etrital Rocks-these rocks have a clastic texture, that is they are composed of fragments compressed and cemented together. In detrital rocks, the clasts are fragments of detritus, the product of weathering of pre-existing rocks.