Almond Formation
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| Almond Formation | |
|---|---|
| Stratigraphic range: Campanian–Maastrichtian | |
| Type | Geological formation |
| Underlies | Lewis Shale |
| Overlies | Ericson Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone, shale, coalb |
| Location | |
| Region | Wyoming |
| Country | United States |
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]
Dinosaurs
Color key
|
Notes Uncertain or tentative taxa are in small text; |
| Dinosaurs of the Almond Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
|
Indeterminate |
Represents a new genus and species of unnamed ceratopsid |
     | ||||
|
Indeterminate[5] |
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|
Indeterminate[5] |
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|
Indeterminate[5] |
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|
Indeterminate[5] |
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|
P. lacustris[5] |
||||||
| Saurolophus[6] | S. sp. | One specimen (AMNH 3651) consisting of partial cranial and postcranial remains, as well as skin impressions | ||||
|
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]
