Snow Hill Island Formation
| Snow Hill Island Formation | |
|---|---|
| Stratigraphic range: Early Maastrichtian | |
Artist's reconstruction of the paleoenvironment of the Snow Hill Island Formation. | |
| Type | Geological formation |
| Unit of | Marambio Group |
| Sub-units | Gamma & Herbert Sound Members |
| Underlies | Lopez de Bertodano Formation |
| Overlies | Santa Marta Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Mudstone |
| Location | |
| Coordinates | 63°54′S 57°54′W / 63.9°S 57.9°W |
| Approximate paleocoordinates | 61°48′S 68°30′W / 61.8°S 68.5°W |
| Region | James Ross Island, James Ross Island group |
| Country | Argentine Antarctica, British Antarctic Territory, Chilean Antarctic Territory |
Geologic map of Seymour Island, Antarctica with Snow Hill Island Formation in dark green | |
The Snow Hill Island Formation is an Early Maastrichtian geologic formation found on James Ross Island, James Ross Island group, Antarctica. Remains of a paravian theropod Imperobator antarcticus have been recovered from it, as well as the elasmarian ornithopods Trinisaura santamartaensis, "Biscoveosaurus" and Morrosaurus antarcticus, the ankylosaurian Antarctopelta oliveroi, and the shark Notidanodon sp. Alongside these described genera are also the remains of indeterminate elasmosaurids, lithostrotian titanosaurs and an indeterminate pterosaur.
In the Herbert Sound Member of the Snow Hill Island Formation, bivalves, ammonites, and fish were found.