Extremely rare association, Sphenodiscus lenticularis and Discoscaphites conradi

Description

Ammonoidea, Sphenodiscidae, Sphenodiscus lenticularis, (Owen, 1852)
Ammonoidea, Scaphitidae, Discoscaphites conradi, (Morton, 1834)
Free standing mortality association with beautiful pearly nacre on the Discoscaphites.
Fox Hills Formation, Timber Lake Member
Northern, South Dakota
Cretaceous, Maastrichtian, birkelundi zone  69 mya
Specimen and Matrix is 80 mm x 64 mm x 50 mm
Sphenodiscus is 64 mm
Discoscaphites is 36 mm