cf. Hypacrosaurus stebingeri Horner & Currie, 1994

Remarks

• Collection:    Lee Garrison
• Formation:   Montana Group, Two Medicine Formation
• Location:      Montana

• The specific assignment is tentative, based on the horizon/geological formation, size, and structure (compare with references below).
• Data compiled by Lee Garrison.  Thanks!

General Info

Synonyms (older names and misidentifications)

• 1994 Hypacrosaurus stebingeri Horner & Currie
• 1998 ?Hypacrosaurus stebingeri Horner & Currie; Ryan, Currie, Gardner, Vickaryous & Lavigne
• 1999 Hypacrosaurus stebingeri Horner & Currie; Carpenter
• 2000 Hypacrosaurus stebingeri Horner & Currie; Horner
• 2001 Hypacrosaurus stebingeri Horner & Currie; Horner, Padian & Ricqlès

Stratigraphic Occurrence

• Montana Group, Two Medicine Formation of Montana
• ? Edmonton Group, Horseshoe Canyon Formation

Age

• Hypacrosaurus stebingeri Horner & Currie is a Latest Campanian–Earliest Maastrichtian Dinosaur (~71 mya).

Geographic Occurrence (not an all-inclusive list)

• Alberta, Canada
• Northern MT

Remarks

       For identification, photographs, and life reconstructions, see:

• Horner, J. & Currie, P. 1994.  "Embryonic and neonatal morphology and ontogeny of a new species of Hypacrosaurus (Ornithischia: Lambeosauridae) from Montana and Alberta".  In:  Carpenter, Hirsh and Horner, ed's.  Dinosaur Eggs and Babies.  New York:  Cambridge University Press, Chapter 21.

• Ryan, M. J., Currie, P. J., Gardner, J. D., Vickaryous, M. K., & Lavigne, J. M.  1998.  Baby hadrosaurid material associated with an unusually high abundance of Troodon teeth from the Horseshoe Canyon Formation, Upper Cretaceous, Alberta, Canada.  Gaia 15, 123–133.

• Carpenter, K.  1999.  Eggs, Nests, and Baby Dinosaurs: A Look at Dinosaur Reproduction.  Bloomington & Indianapolis:  Indiana University Press.  Figure 11.33, p. 212 (photo of a composite Hypacrosaurus stebingeri skeleton); Figure 12.2, p. 218 (photo of a juvenile Hypacrosaurus stebingeri bone bed); Figure 12.3, p.219 (Hypacrosaurus stebingeri life reconstruction); Figure 12.8, p. 225 (photo of ten Hypacrosaurus stebingeri femora).

• Horner, J. R.  2000.  Dinosaur reproduction and parenting.  Annual Review of Earth and Planetary Sciences 28, 19–45.

• Horner, J. R., Padian, K., and de Ricqlès, A.  2001.  Comparative osteohistology of some embryonic and perinatal archosaurs: developmental and behavioral implications for dinosaurs.  Paleobiology 27(1): 39–58.