Almond Formation

The Almond Formation is a geological formation of Late Cretaceous (Late Campanian-Early Maastrichtian^[1]) age in Wyoming. It was deposited in marsh, deltaic, lagoonal, estuarine, and shallow marine environments along the western shore of the Western Interior Seaway. It consists primarily of fine- to medium-grained sandstone, siltstone, shale, and coal.^[2] Fossils from the Almond Formation include remains of dinosaurs^[3] and plants.^[4]

Almond Formation
Stratigraphic range: Campanian–Maastrichtian 73.6–71.1 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Lewis Shale
Overlies	Ericson Formation
Lithology
Primary	Sandstone
Other	Siltstone, shale, coalb
Location
Region	Wyoming
Country	United States

Vertebrate paleofauna

Dinosaurs

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs of the Almond Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Anchiceratops	Indeterminate				Represents a new genus and species of unnamed ceratopsid	Dromaeosaurus Edmontonia Edmontosaurus Thescelosaurus Unnamed chasmosaurine ceratopsid
Dromaeosaurus[5]	Indeterminate[5]
Edmontonia[5]	Indeterminate[5]
Edmontosaurus[5]	Indeterminate[5]
Maiasaura[5]	Indeterminate[5]
Paronychodon[5]	P. lacustris[5]
Saurolophus[6]	S. sp.			One specimen (AMNH 3651) consisting of partial cranial and postcranial remains, as well as skin impressions
Thescelosaurus[7]	Indeterminate[7]
Unnamed chasmosaurine ceratopsid[8]	Unnamed				Misidentified as Anchiceratops, it is actually a new species of Pentaceratops-like form that is the sister taxon to Bisticeratops.[9] Holotype was discovered in 1937.

Other vertebrates

Non-dinosaur vertebrates found in the Almond Formation include crocodyliforms (indet.), turtles (Adocus cf. and Basilemys cf.), and ray-finned fish (Ichthyodectidae indet.).^[10]

See also

• Earth sciences portal
• Paleontology portal
• Dinosaurs portal

• List of dinosaur-bearing rock formations