Scannella, J.B.; Fowler, D.W.; Goodwin, M.B.; Horner, J.R.
taxonomy · range · morphology · biogeography · methods
A stratigraphically controlled Hell Creek skull sample documents cranial character variation; proposed evolutionary mode remains sensitive to taxon and character treatment.
In the stratigraphically controlled Hell Creek skull sample, nasal-horn, rostrum and postorbital-horn characters vary among specimens and intermediate character combinations occur in the middle unit; these are sampled cranial observations, not a direct ancestor–descendant series.
claim:taxon:triceratops:profile-morphologyThis profile's geographic statement is limited to the northeastern Montana Hell Creek Formation skull sample; it does not assert a genus-wide geographic range or distributional preference.
claim:taxon:triceratops:profile-biogeographyThe cited cranial and stratigraphic studies do not directly determine diet, habitat preference, locomotion, body size or ecological guild for Triceratops; those profile fields are explicitly withheld.
claim:taxon:triceratops:profile-ecology