These thick coal beds lie within Middle Miocene (? according to Witts et all 2011, IPA Proceedings) Warukin Formation in the Barito Basin. Not all coals are this thick . . . today we logged a section that included a 1 m thick coal overlain by a marine transgressive mud with abundant small aragonitic molluscs. The fauna was dominated by protobranch bivalves typical of very fine grained organic-rich marine muds. Sorry, no seagrasses here (yet).
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