Russia, Perm region, Saranovskoe chromite deposit. Saranovskiy chromite-bearing gabbro-peridotite massif. Possesses large reserves of chromite ores. The outcropping area of ultrabasic rocks is only 0.22 km2, with a length of 1700-1800 m and a width of about 200 m. The maximum width of the massif in the middle part, including gabbroids, is about 400 m. Its strike is submeridional (0-345 °).
Russia, Republic of Sakha, Aldan river valley. Tiled, gray, greenish-gray dolostones with intercalations of clay and oolithic dolostones. Saturated with mineralized cylindrical burrows (diameter up to 1 centimeter) of worms (planolites and skolitos). Neoproterozoic - Cambrian.