Snow Hill Island Formation

Snow Hill Island Formation
Stratigraphic range: Early Maastrichtian 71.2–70.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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 / -63.9; -57.9
Approximate paleocoordinates	61°48′S 68°30′W / 61.8°S 68.5°W / -61.8; -68.5
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.^[1] Remains of a paravian theropod Imperobator antarcticus^[2] 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,^[3] lithostrotian titanosaurs and an indeterminate pterosaur.^[4]

In the Herbert Sound Member of the Snow Hill Island Formation, bivalves, ammonites, and fish were found.^[5]