Cambrian

Russia, Komi Republic, Subpolar Ural, upper reaches of the Little Lemva river. Gray-green siltstones. Consist: quartz, feldspar, sericite, chlorite. Accesory: hematite, magnetite, leicocsen, zircon, epidote. Fossil: Aristocystites (?) sp., Fascicrinus cf. foliacens Mil sp. nov., Pentagonocyclicus cf. concentricus Yelt., Veryhachium trisulcum Downie Baltisphaeridium longispinosum Ets. Pogureyskaya series. Cambrian (Furongian) - Lower Ordovican (Tremadocian).

Russia, Khanty-Mansiysk autonomous okrug, Subpolar Ural, Petravozh creek. Gray-green siltstones, sandstones with dykes gabbro. Sedimentary rocks consist: quartz, feldspar, sericite, chlorite. Accesory: hematite, magnetite, leicocsen, zircon, epidote. Fossil: Aristocystites (?) sp., Fascicrinus cf. foliacens Mil sp. nov., Pentagonocyclicus cf. concentricus Yelt., Veryhachium trisulcum Downie Baltisphaeridium longispinosum Ets. Pogureyskaya series. Cambrian (Furongian) - Lower Ordovican (Tremadocian). Dykes gabbro: Upper Ordovican - Lower Silurian.

Russia, Komi Republic, Subpolar Ural, upper reaches of the Little Lemva river. Gray-green siltstones. Consist: quartz, feldspar, sericite, chlorite. Accesory: hematite, magnetite, leicocsen, zircon, epidote. Fossil: Aristocystites (?) sp., Fascicrinus cf. foliacens Mil sp. nov., Pentagonocyclicus cf. concentricus Yelt., Veryhachium trisulcum Downie Baltisphaeridium longispinosum Ets. Pogureyskaya series. Cambrian (Furongian) - Lower Ordovican (Tremadocian).

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.

Sardinia, Monte Corrasi. Low Paleozoic terrigenous succession. Metasandstones quartzites and phyllites with alternating interlayered acid metavolcanic rocks. Cambrian?