Among them were hadrosaur bones preserved in the Dakota Formation.

The term now includes strata that had formerly been called the Dakota Formation in central and southern Wyoming.

The area is highlighted by outcrops of Cretaceous-era sandstone known as the Dakota Formation.

The Dakota Formation in Iowa and its type area.

The Dakota Formation is an important aquifer in some areas of the Great Plains.

The very top of the Dakota Formation was deposited along the coast as indicated by some fossil marine invertebrates.

Dinosaur fossils are very rare in the Dakota Formation and most of them come from Kansas.

The Dakota Formation forms the eastern region.

This was the first scientifically documented dinosaur bone discovered in the Dakota Formation.

Oysters and other mollusks were preserved in the sediments now composing the Dakota Formation.