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concretion in gray shale (fort payne formation, lower mississippian; burkesville west rt. 90 roadcut, kentucky, usa) 4 color palette

#2F2E2C #5A595C #41403E #9E9A9F #7D7B83
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related tags: 2E2E2D 2F2E2C 40403F 41403E 5A595C 5A5A5B 7D7B83 7E7D81 9D9B9E 9E9A9F burkesville concretion concretions formation fort ft gray kentucky mississippian osagean payne shale shales