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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 are made up of pieces of other rocks. For example, sand on a beach or in a dune can get buried. Under the pressure of burial, the sand is pressed together and compacted.e will find mud, not large cobbles, in the middle of a quiet lake. The rock that can eventually form that mud is a shale. We do find gravel, pebbles, cobbles, and boulders in the middle of a mountain stream. A conglomerate can form from these materials.