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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.
Quartzite is a tough stone composed mostly of quartz. It may be derived from sandstone or from chert by regional metamorphism. (more below). Quartzite forms in two different ways. In the first way, under the pressures and temperatures of deep burial, sandstone or chert recrystallizes resulting in a metamorphic rock.A quartzite in which all traces of the original grains and sedimentary structures are erased may also be called metaquartzite.This Las Vegas boulder is a metaquartzite.more below). Quartzite forms in two different ways. In the first way, under the pressures and temperatures of deep burial, sandstone or chert recrystallizes resulting in a metamorphic rock. A quartzite in which all traces of the original grains and sedimentary structures are erased may also be called metaquartzite.