In kularites (nodular monazites - NM) from alluvial deposits of the Urasalakh, Konechny and Kristall streams of the kular ridge (Republic of Sakha (Yakutia)) biomorphic structures lithified by REE phosphate (monazite) were found, represented by cyanobacteria, distributed in the form of peculiar “stromatolite-like” microstructures. In addition, framboidal iron sulfides (mackinawite pyrite, greigite) were identified in monazites of kularites. The isotopic composition of organic carbon in NM corresponds to the biogenic one - δ13С from -22.2 ‰ to -22.3 ‰.
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С et al. (2024) studied this question.
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