fossil plant in carbonaceous shale (top of pottsville formation, middle pennsylvanian; old coal mine ene of st. clair, pennsylvania, usa) 18 color palette

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#535256 #4C422B #E5C915 #EDD113 #C6C3C0

related tags: 433E33 4C422B B1A349 B7A94A C4C3C2 C6C3C0 E5C915 EDD113 carbonaceous carboniferous clair coal fossil graphite mine pennsylvania pennsylvanian plants pyrophyllite shale st 535256 545355