Message #194914

[Moonfire]

Paleoecology

Allosaurus was the most common large theropod in the vast tract of Western American fossil-bearing rock known as the Morrison Formation, accounting for 70 to 75% of theropod specimens,[5] and as such was at the top trophic level of the Morrison food web.[71] The Morrison Formation is interpreted as a semiarid environment with distinct wet and dry seasons, and flat floodplains.[72] Vegetation varied from river-lining forests of conifers, tree ferns, and ferns, to fern savannas with rare trees.[73]