PDF versionDunkardian (Dun-kard'-i-an). North American provincial series: uppermost Pennsylvanian-Lower Permian (above Monongahelan).
PDF versionDunkardian
PDF versionPDF versionPDF versionPDF versionDunkardian (Dun-kard'-i-an). North American provincial series: uppermost Pennsylvanian-Lower Permian (above Monongahelan).