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. 2021 Apr 27;31(8):1250–1263. doi: 10.1177/09596836211011652

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© The Author(s) 2021

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Figure 2. — Upper surface (top photo) and lower surface (bottom photo) of Fe–Mn concretion ML2014 from Magaguadavic Lake, New Brunswick, Canada. A lithic fragment forms the central nucleus. The surrounding brown-black material is the concretion, comprised mostly of Fe and Mn oxyhydroxides.