Genus · Ornithomimidae · Cretaceous

Ornithomimus

Named by Marsh 1890

Ornithomimus lived 83.6–66 million years ago, during the Campanian to Maastrichtian stages of the Late Cretaceous. The Paleobiology Database lists 35 fossil records for it from 2 countries (United States and Canada) — the 33rd 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 10 formations; the largest share, 26%, is from the Lance Formation.
Triceratops appears in 17% of the collections that hold Ornithomimus; Edmontosaurus in 14%.
Its stage range spans about 17.6 million years (15th longest of 99); it is the 11th best-recorded of the 32 theropods here.

4 accepted species

Species	Named by	Records
Ornithomimus edmontonicus	Sternberg 1933	7
Ornithomimus velox	Marsh 1890	5
Ornithomimus minutus	Marsh 1892	1
Ornithomimus tenuis	Marsh 1890	1

Where it was found

35 records with coordinates.

Found alongside

Rock formations

States & provinces

Region	Records	Share
Alberta	10	29%
Wyoming	7	20%
Colorado	4	11%
Montana	4	11%
North Carolina	3	9%
South Dakota	3	9%
Saskatchewan	1	3%
New Mexico	1	3%

Country	Records	Share
United States	24	69%
Canada	11	31%

Records by stage

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

Campanian12
Maastrichtian23

Depositional settings

Channel lag2
Transition zone/lower shoreface1
Fine channel fill1
Estuary/bay1

Other theropods of its time

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

Genus	Age	Country	Records
Tarbosaurus	72.1–66 Ma	Mongolia, China	56
Dromaeosaurus	83.6–66 Ma	Canada, United States	48
Albertosaurus	83.6–66 Ma	Canada, United States	32
Gallimimus	72.1–66 Ma	Mongolia, Uzbekistan	30
Masiakasaurus	72.1–66 Ma	Madagascar	29
Chirostenotes	83.6–66 Ma	United States, Canada	28
Majungasaurus	72.1–66 Ma	Madagascar	25
Daspletosaurus	83.6–72.1 Ma	United States, Canada	21

Also from these formations