Almond Formation | |
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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]
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] | ||||||
Indeterminate [5] | ||||||
Indeterminate [5] | ||||||
Indeterminate [5] | ||||||
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. | ||||
Non-dinosaur vertebrates found in the Almond Formation include crocodyliforms (indet.), turtles ( Adocus cf. and Basilemys cf.), and ray-finned fish (Ichthyodectidae indet.). [10]