Locality: Near Fish Creek, in Sweetgrass County, Montana.
Horizon: Fort Pierre Formation.
Age: Late Cretaceous.
Number: Not given: Fragmentary skeleton with nearly a dozen Nautili were found among the bones.
LULL & WRIGHT, 1942
Locality: Big Bend of the Rio Grande, Brewster County, Texas.
Horizon: Aguja Formation.
Age: Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.
Number: Not given: Several limb bones and vertebrae.