Genus · Thescelosauridae · Cretaceous

Thescelosaurus

Named by Gilmore 1913

Thescelosaurus lived 83.6–66 million years ago, during the Campanian to Maastrichtian stages of the Late Cretaceous. The Paleobiology Database lists 55 fossil records for it from 2 countries (United States and Canada) — the 18th most of the 99 genera on this site.

Where it sits in time

Key facts from the records

Its records are spread over at least 9 formations; the largest share, 53%, is from the Hell Creek Formation.
Tyrannosaurus appears in 31% of the collections that hold Thescelosaurus; Troodon in 30%.
Its stage range spans about 17.6 million years (15th longest of 99); it is the 4th best-recorded of the 21 ornithopods here.

4 accepted species

Species	Named by	Records
Thescelosaurus neglectus	Gilmore 1913	28
Thescelosaurus assiniboiensis	Brown et al. 2011	1
Thescelosaurus edmontonensis	Sternberg 1940	1
Thescelosaurus garbanii	Morris 1976	1

Where it was found

55 records with coordinates.

Found alongside

Rock formations

States & provinces

Region	Records	Share
Montana	16	29%
Alberta	11	20%
North Dakota	8	15%
South Dakota	8	15%
Wyoming	7	13%
Saskatchewan	2	4%
Colorado	1	2%
New Mexico	1	2%

Country	Records	Share
United States	42	76%
Canada	13	24%

Records by stage

Well-dated records, by the stage of their mid-point age.

Turonian1
Campanian9
Maastrichtian44

Depositional settings

Channel8
Crevasse splay8
Channel lag6
Coarse channel fill5
Floodplain2

Other ornithopods of its time

Same group, overlapping stage range, not found in the same collections.

Genus	Age	Country	Records
Zalmoxes	83.6–66 Ma	Romania, Austria	44
Saurolophus	72.1–66 Ma	Mongolia, Canada	38
Hypacrosaurus	83.6–66 Ma	Canada, United States	37
Rhabdodon	83.6–66 Ma	France, Spain	37
Gryposaurus	199.5–72.1 Ma	Canada, United States	31
Corythosaurus	83.6–72.1 Ma	Canada, United States	29
Kritosaurus	83.6–72.1 Ma	United States, Canada	25
Telmatosaurus	72.1–66 Ma	Romania, France	23

Also from these formations