Cincinnati Museum Center

Late Ordovician ostracods from the “butter shale” Lagerstätten of the Cincinnati Arch region, Ohio, USA

Abstract The “butter shale” Lagerstätten of the Cincinnati Arch region is renowned for its well-preserved fossil records, documenting the dynamics of the Late Ordovician “Richmondian Invasion,” during which faunal migration from multiple source basins into the region led to a dra...