Prismatoolithus levis Zelenitsky & Hills, 1996

Remarks

• Collection:      Lee Garrison

• Formation:     Montana Group, Two Medicine Formation

• Location:        Montana

General Info

Synonyms (older names and misidentifications in the literature)

• Egg of Troodon formosus Leidy
• 1996 Prismatoolithus levis Zelenitsky & Hills
• 2002 Prismatoolithus levis Zelenitsky & Hills; Varricchio, Horner & Jackson
• 2002 Prismatoolithus levis Zelenitsky & Hills; Zelenitsky, Modesto & Currie
• 2004 Prismatoolithus levis Zelenitsky & Hills; Varricchio & Jackson

Stratigraphic Occurrence

• Judith River Group, Two Medicine Formation of Montana

• Judith River Group, Judith River Formation of Montana

• Judith River Group, Oldman Formation of Alberta, Canada

Age

• The reported occurrences of Prismatoolithus levis Zelenitsky & Hills indicate a range of late Middle Campanian Stage to early Late Campanian Stage (~75–73 mya).  However, Troodon formosus Leidy is known to range from the middle Late Campanian Stage to the Latest Maastrichtian Stage (~74–66 mya), so we're either missing some reports, or some pieces of the puzzle still await to be collected from the Hell Creek/Lance and Judith River Formations (the Judith River Fm is slightly old than the Oldman Fm according to our sources).

Geographic Occurrence (not an all-inclusive list)

• Alberta, Canada

• Hill County, MT

• Teton County, MT

Remarks

        For photographs and more information see:

• Varricchio, D.; Horner, J. R.; Jackson, F. D.  2002.  Embryos and Eggs for the Cretaceous Theropod Dinosaur Troodon Formosus.  Journal of Vertebrate Paleontology 22 (3), 564–576.

• Varricchio, D. J.; Jackson, F. D.  2004.  A Phylogenetic Assessment of Prismatic Dinosaur Eggs from the Cretaceous Two Medicine Formation of Montana.  Journal of Vertebrate Paleontology 24 (4), 931–937.

• Zelenitsky, D. K.; Hills, L. V. 1996.  An Egg Clutch of Prismatoolithus levis Oosp. Nov. from the Oldman Formation (Upper Cretaceous), Devil's Coulee, Southern Alberta. Canadian Journal of Earth Sciences 33, 1127–1131.

• Zelenitsky, D. K.; Modesto, S. P.; Currie, P. J. 2002.  Bird-Like Characteristics of Troodontid Theropod Eggshell.  Cretaceous Research 23, 297–305.