related tags: 6C6B6C 8A8887 8C8886 9D9B9C 9E9A9C BFBAB9 C2B8B5 D2CFCF D4CDCD archean deformation fold folding folds formation graywacke lake metagraywacke minnesota neoarchean peyla precambrian sediment shale slate soft tower turbidites vermilion
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