Dinosauria›Reptilia
Allosaurus Allosaurus fragilis (Marsh 1877)
/ˌæləˈsɔːrəs/
Late Jurassic (Tithonian) · 154.8–143.1 Mya
Key Statistics
Diet
carnivore
Locomotion
bipedal
inferred from clade
Habitat
ground-dwelling
Social
solitary
Where It Was Found
Country
United States
Regions
Wyoming · Colorado · Utah
Formation
Morrison
Dig sites
14
distinct collections
Overview
Allosaurus fragilis is a theropod dinosaur known from the Late Jurassic, roughly 154.8–143.1 million years ago. It was a carnivore. It is recorded as ground-dwelling and solitary. Fossils have been recovered from Wyoming, United States. It was named by (Marsh 1877). The species is represented by 29 recorded occurrences in the Paleobiology Database.
Fossil Record Completeness
How much of this profile is grounded in the fossil record
~69%
well attested
Based on 29 recorded occurrences in the Paleobiology Database.
Geologic Time
Where Allosaurus fragilis sits in deep time
Allosaurus
252 Mya201 Mya145 Mya66 Mya
Relationships
Part of a wider fossil web
These species share Allosaurus fragilis's place in deep time — computed from overlapping age ranges, shared clades, and inferred ecology. Predator–prey pairs additionally have to have been dug up in the same place.