Rovno amber is found in this formation,[2] and 90% of amber collected from the Obukhov Formation is extracted illegally and the trade is controlled by armed organised crime groups.[2]
The two formations total between 2–7 m (6.6–23.0 ft) in thickness, both containing interbeds or mixtures of brown coals and carbonized vegetation. Both formations are sandy to clayey in texture, with the Obukhov Formation having more clayey glauconite-quartz plus sandy loess.[5]
^ abcdPerkovsky, E. E.; Zosimovich, V. Y.; Vlaskin, A. P. (2010). "Chapter 7: Rovno amber". In Penney, D. (ed.). Biodiversity of Fossils in Amber from the Major World Deposits. Siri Scientific Press. pp. 116–136. ISBN978-0-9558636-4-6.
^Perkovsky, E. E.; Rasnitsyn, A. P.; Vlaskin, A. P.; Taraschuk, M. V. (2007). "A comparative analysis of the Baltic and Rovno amber arthropod faunas: representative samples". African Invertebrates. 48 (1): 229–245.
^Perkovsky, E. E.; Zosimovich, V. Y.; Vlaskin, A. P. (2003). "A Rovno amber fauna: a preliminary report". Acta Zoologica Cracoviensia. 46(Supplemental): 423–430.