Wahweap Formation
| Wahweap Formation Stratigraphic range: Campanian |
|
|---|---|
| Type | Geological formation |
| Location | |
| Region | North America |
| Extent | Southern Utah, Northern Arizona |
| Type section | |
| Named for | Wahweap Creek |
The Wahweap Formation of the Grand Staircase-Escalante National Monument is a geological formation in southern Utah and northern Arizona, around the Lake Powell region, whose strata date back to the Late Cretaceous (Campanian stage). Dinosaur remains are among the fossils that have been recovered from the formation.
The Wahweap Formation shows a substantial amount of invertebrate activity ranging from fossilized insect burrows in petrified logs to various mollusks that characterize the shell beds. Large fossilized crabs are common at most shell bed sites in the Wahweap, and over 1,900 gastropod specimens (of four likely genera) have been unearthed in the formation's siltstone.
In addition to terrestrial vertebrates, freshwater fish fossils have been uncovered from the Wahweap which include bowfin vertebrae,ray teeth, and probable lungfish burrows.
Dinosaurs known from the Wahweap include, at least one type of hadrosaur, at least one or two ceratopsians and at least one theropod.
A. hutchisoni
A. gagslarsoni
A hadrosaurid closely related to Brachylophosaurus and Maiasaura
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