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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.
The name of a sedimentary rock depends on the size (and sometimes the shape) of the rock pieces that it is made of: 1  Conglomerate is composed of rounded gravel, pebbles, cobbles, or boulders along with smaller rock pieces.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.