The Ordovician rocks comprise flaggy shales, limestones, red quartzites, quartzites, sandstones and conglomerates. Other crystalline rocks, the metamorphic rocks such as marbles, mica-schists and quartzites, are recrystallized. Dolomite limestones with stromatalite fossils and quartzites are found in the Kazakh Uplands. The layers of marble are interbedded with schists and quartzites. It is made by phyllites, quartzites, porphyrys and limestones commonly metamorphosed to siderite and magnesite. Among major valuable deposits and minerals there are nickel, uranium ores, granite, gneiss, quartzites. This rock unit is formed by quartzites, meta-black shales, amphibolites and skarns. The Boyd Plateau comprises a dome of Devonian granite intruded into Devonian quartzites and sedimentaries. Precambrian formations of the Daling series of quartzites and phyllites dominate the area. The thinly bedded quartzites have been quarried for building stone in the area. Most of the high ground and ridgetops are sequences of quartzites that outcrop along strike.