[1] The Wahweap formation is divided into four members, which are listed below with their respective ages:[2] The Wahweap Formation shows a substantial amount of invertebrate activity ranging from fossilized insect burrows in petrified logs[3] to various mollusks that characterize the shell beds.

Large fossilized crabs are common at most shell bed sites in the Wahweap,[4] and over 1,900 gastropod specimens (of four likely genera) have been unearthed in the formation's siltstone.

[23] Trace fossils are also relatively abundant in the Wahweap, and include vertebrate tracks as well as burrow activity.

Tracks preserved in the capping sandstone indicate the presence of crocodylomorphs, which had been previously known in this area only from teeth elements, as well as ornithischian dinosaurs.

The proximity indicates a case of probable active predation of the burrow inhabitants by the owners of the claw marks.