Snow Hill Island Formation

Snow Hill Island Formation Stratigraphic range: Late Campanian PreꞒ Ꞓ O S D C P T J K Pg N [1]
Type	Geological formation
Unit of
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; -57.9Coordinates: 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	Antarctica
Geologic map of Seymour Island, Antarctica with Snow Hill Island Formation in dark green

The Snow Hill Island Formation is a Late Campanian geologic formation found on James Ross Island, James Ross Island group, Antarctica. 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.

In the Herbert Sound Member of the Snow Hill Island Formation, bivalves, ammonites, and fish were found.^[4]

See also[]

• List of fossiliferous stratigraphic units in Antarctica
• List of dinosaur-bearing rock formations
• Sobral Formation
• South Polar region of the Cretaceous

References[]

Bibliography[]

• Ely, Ricardo C., and Judd A. Case. 2019. Phylogeny of a new gigantic paravian (Theropoda; Coelurosauria; Maniraptora) from the Upper Cretaceous of James Ross Island, Antarctica. Cretaceous Research 101. 1–16. doi:10.1016/j.cretres.2019.04.003
• O'Gorman, J.P. 2012. The oldest elasmosaurs (Sauropterygia, Plesiosauria) from Antarctica, Santa Marta Formation (upper Coniacian? Santonian-?upper Campanian) and Snow Hill Island Formation (upper Campanian-?lower Maastrichtian), James Ross Island. Polar Research 31. 1–10. Accessed 2019-04-13. doi:10.3402/polar.v31i0.11090
• Pirrie, D.; J.A. Crame; S.A. Lomas, and J.B. Riding. 1997. Late Cretaceous stratigraphy of the Admiralty Sound region, James Ross Basin, Antarctica. Cretaceous Research 18. 109–137. doi:10.1006/cres.1996.0052

Further reading[]

• D. Néraudeau, A. Crame, and M. Kooser. 2000. Upper Cretaceous echinoids from James Ross Basin, Antarctica. Géobios 33(4):455-466 doi:10.1016/S0016-6995(00)80079-0
• R. A. Otero, S. Soto-Acuna, A. O. Vargas, D. Rubilar Rogers, R. E. Yury Yanez and C. S. Gutstein. 2013. Additions to the diversity of elasmosaurid plesiosaurs from the Upper Cretaceous of Antarctica. Gondwana Research doi:10.1016/j.gr.2013.07.016