At least three species have been identified in the upper Morrison Formation and are known from the remains of about 80 individuals.

These sediments deposited what is now known as the Morrison Formation.

Present in stratigraphic zones 4 and 5 of the Morrison Formation.

Local dinosaurs were preserved in the sediments of the Morrison Formation.

It is present in stratigraphic zone 1 of the Morrison Formation.

The Morrison Formation has been a rich fossil hunting ground.

This species may have been the most massive known in the entire Morrison Formation, with estimated putting its body weight at more than 100,000 lbs.

This was the smallest known sauropod species of the Morrison Formation.

Its fossils were found in the Morrison Formation of Utah.

It is known from a single site from the lower Morrison Formation, dating to about 154 million years ago.