Species: peeblesorum HORNER & MAKELA, 1979
Etymology: In honor of the James and John Peebles families, owners of the land
where the specimens were collected.
Locality: 12 miles west of Choteau, on the James and John Peebles Ranch, Willow Creek Anticline, Teton County, Montana.
Horizon: Two Medicine Formation.
Biostratigraphy:
Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.
Referred material:
STEIN, 2001
Pathological neural spine (a neural arch with 3 spines).