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To determine age and genesis of rock series fossiles of macro- and microbiote have a great importance. In altered rocks organogenic remnants could be preserved as relics of initial substrate or pseudomorphic replaced by hemogenic substance fossils. It is necessity in difference of replaced remnants and mineralogical aggregates.
L. V. Leonova andE. I. Soroka
"Problematic microfossils in ancient (Paleozoic) rocks of the Urals", Proc. SPIE 4939, Instruments, Methods, and Missions for Astrobiology VI, (30 January 2003); https://doi.org/10.1117/12.486702
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L. V. Leonova, E. I. Soroka, "Problematic microfossils in ancient (Paleozoic) rocks of the Urals," Proc. SPIE 4939, Instruments, Methods, and Missions for Astrobiology VI, (30 January 2003); https://doi.org/10.1117/12.486702