Apatosaurus Apatosaurus ajax (Marsh 1877)
/əˌpætəˈsɔːrəs/
Late Jurassic (Tithonian) · 154.8–143.1 Mya
Key Statistics
Diet
herbivore
Locomotion
quadrupedal
inferred from clade
Habitat
ground-dwelling
Social
herding
Where It Was Found
Country
United States
Region
Colorado
Formation
Morrison
Dig sites
3
distinct collections
Overview
Apatosaurus ajax is a sauropodomorph dinosaur known from the Late Jurassic, roughly 154.8–143.1 million years ago. It was a herbivore. It is recorded as ground-dwelling and herding. Fossils have been recovered from Colorado, United States. It was named by (Marsh 1877). The species is represented by 3 recorded occurrences in the Paleobiology Database.
Fossil Record Completeness
How much of this profile is grounded in the fossil record
~11%
confidence from occurrence count
Based on 3 recorded occurrences in the Paleobiology Database.
Geologic Time
Where Apatosaurus ajax sits in deep time
Apatosaurus
252 Mya201 Mya145 Mya66 Mya
Relationships
Part of a wider fossil web
These species share Apatosaurus ajax'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.