arikaree group sandstones over brule formation (miocene-oligocene; south bluff, scott's bluff national monument, nebraska, usa) color palette

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#797742 #6B6C17 #F2F6F6 #C0A682 #A18C52

related tags: 56572D 6B6C17 6C6A50 8E8366 A18C52 B1A391 C0A682 F2F6F6 F3F5F5 arikaree bluff brule creek formation group harrison hills miocene monroe monument national nebraska oligocene ridge sandstone scotts south tertiary wildcat 797742