Burro Canyon Formation (UT) [Aptian to Cenomanian]
Unknown Stage
Benton Shale (CO)
Carlile Shale (Blue Hill Mbr) (KS)
Carlile Shale (Fairport Mbr) (KS)
Mancos Shale (CO)
Mooreville Formation (AL)
Montana Formation (MT)
Montana Formation (WY)
Mowry Shale (WY)
Niobrara Formation (CO)
Niobrara Formation (Smoky Hill Mbr) (KS)
Niobrara Formation (NM)
Pierre Shale (CO)
Pierre Shale (SD)
X-fish at the KU NHM. Xiphactinus audax from the Santonian Niobrara Fm. of Colorado (FHSMVP 333). Xiphactinus audax from the Late Cretaceous Niobrara Fm. of Logan County, Kansas (YPM 002177).