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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.
Sandstone is a common clastic sedimentary rock formed by the compaction and cementation of sand (quartz grains). Conglomerate is another clastic sedimentary rock formed by the cementation of rounded boulders, cobbles, and pebbles.On the other hand, breccia forms from angular boulders, cobbles, and pebbles.oal is considered a sedimentary rock. Some might classify it as a biologic sedimentary rock as it forms from the compaction and alteration of accumulated plant matter. Coal is classified into one of three types depending on its level of development. Lignite is a soft, brown coal and is the least developed form.