. . . . . . . . . . "Carbonate facies of the Swope Limestone Formation (Upper Pennsylvanian), Southeast Kansas" . . . . "Carbonate facies of the Swope Limestone Formation (Upper Pennsylvanian), southeast Kansas"@en . "Carbonate facies of the Swope Limestone Formation (Upper Pennsylvanian), southeast Kansas" . . . . . "From 280 to 310 million years ago" . .