Name: didymoceras cheyennensis + baculites baculus + scaphites spStage: Maastrichtian, Upper Cretaceousshale stone formationOrigin: jefferson county, colorado, usacut:matrix: 33 cmdidymocera: 19 cmvery nice association with a rare didymoceras, dozens of baculites and a scaphitesanother didymoceras i..