Bubnova М.В., Chaikovskiy И.И. and Chirkova Е.П. 2022. Polymineral nodules from the salt-marl sequence of the Solikamsk depression . Problems of mineralogy, petrography and metallogeny. Scientific readings in memory of P.N. Chirvinsky. 25 (Apr. 2022), 18–26. DOI:https://doi.org/10.17072/chirvinsky.2022.18.