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The conglomerate is overlain by a claystone-dominated fossiliferous interval, which contains spirorbid worm tubes, abundant conchostracans, plant debris, fusain , and a pygocephalomorph-bearing limestone.
In nearly all cases, fusain had the largest ratio of C-C bonds.
Minor amounts of fusain also occur in association with the fossils.
Forest fire, a major disturbance agent in some modern forests, does not appear to be a major factor given the rarity of fusain in the Buchanan Lake Formation deposits.
As an independent check on the overall oxygen trend, it is notable that fusain is found for the first time in the Late Devonian.
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