Nucula percrassa

Geological Range

Campanian to Maastrichtian

Georgia to Montana

Maastrichtian: Fox Hills Formation (Timber Lake Member) (SD); Owl Creek Formation (MS); Prairie Bluff Formation (AL); Providence Formation (GA); Ripley Formation (GA); Ripley Formation (MS); Ripley Formation (Coon Creek Member) (TN); Severn Formation (MD)
Campanian: Blufftown Formation (GA); Coffee Sand Formation (MS); Pierre Shale (SD) [Campanian]
Unknown Stage: Caddo Formation (OK); Coffee Sand Formation (MS); Coon Creek Formation (AL); Coon Creek Formation (TN); Pierre Shale (MT); Prairie Bluff Formation (AL); Ripley Formation (MS); Ripley Formation (TN); Selma Chalk (MS)