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Fig. 7 | Journal of Palaeogeography

Fig. 7

From: Ooidal ironstones in the Meso-Cenozoic sequences in western Siberia: assessment of formation processes and relationship with regional and global earth processes

Fig. 7

Lithostratigraphic column for well 803 showing geochemical profiles of TOC, Hg, Hg/TOC, elemental enrichment factors (EFs). Correlation between high content of TOC, Hg/TOC, and elevated enrichment factors of Mo, U, V indicates two hypoxic intervals (marked by light grey shades). Paucity of pyrite framboids rules out hypoxia in the Maastrichtian-Paleocene sequences. Form. = Formation; ir.= ironstone

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