. . . . . . . . . . . . . . . "Taxonomy, paleoecology and biostratigraphy of the crinoids of the South Bend Limestone (Late Pennsylvanian-Missourian,? Virgilian) in southeastern Nebraska and southeastern Kansas"@en . . "Taxonomy, paleoecology, and biostratigraphy of the crinoids of the South Bend Limestone (Late Pennsylvanian-Missourian,?Virgilian) in southeastern Nebraska and southeastern Kansas"@en . . . "From 280 to 310 million years ago" . .