Hidden Lake Formation

Hidden Lake Formation
Stratigraphic range: Coniacian [1]
Type	Geological formation
Unit of	Gustav Group
Underlies	Santa Marta Formation
Overlies	Whisky Bay Formation
Lithology
Primary	Sandstone
Other	Siltstone
Location
Coordinates	63°00′S57°00′W / 63.0°S 57.0°W / -63.0; -57.0
Approximate paleocoordinates	63°06′S63°54′W / 63.1°S 63.9°W / -63.1; -63.9
Region	James Ross Island, James Ross Island group
Country	Argentine Antarctica, British Antarctic Territory, Chilean Antarctic Territory
Type section
Named for	Hidden Lake
Map of James Ross Island group James Ross Island is number 2

The Hidden Lake Formation is a Late Cretaceous geologic formation in Antarctica. The sandstones and siltstones of the formation were deposited in a deltaic environment.

Indeterminate megalosaur remains have been recovered from it. ^[2] Also many plant fossils and ichnofossils of Planolites sp. and Palaeophycus sp. have been found in the formation. ^[3]

Paleofauna

• Megalosauroidea indet. ^[2]
• Palaeophycus sp. ^[3]
• Planolites sp. ^[3]

Flora

• Antarctoxylon mixai ^[4]
• Dicotylophyllum ^[5]
• Elatocladus cf. heterophylla ^[5]
• Lygodium sp. ^[5]
• Microphyllopteris sp. ^[5]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils
• List of fossiliferous stratigraphic units in Antarctica
  • Snow Hill Island Formation

References

1. Crame, J. A.; Pirrie, D.; Riding, J. B. (2006). "Mid-Cretaceous stratigraphy of the James Ross Basin, Antarctica" . Geological Society, London, Special Publications. 258 (1): 7–19. Bibcode:2006GSLSP.258....7C. doi:10.1144/GSL.SP.2006.258.01.02. ISSN   0305-8719.
2. Weishampel, et al. (2004). "Dinosaur distribution" pp. 517–607. in Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp.  ISBN   0-520-24209-2. " pp. 517–607.
3. Hidden Lake at Fossilworks.org
4. Sakala, Jakub; Vodrážka, Radek (August 2014). "A new species of Antarctoxylon : a contribution to the early angiosperm ecosystem of Antarctica during the late Cretaceous". Antarctic Science. 26 (4): 371–376. Bibcode:2014AntSc..26..371S. doi: 10.1017/S095410201300076X . ISSN   0954-1020.
5. Kvaček, Jiří; Sakala, Jakub (2011-06-01). "Late Cretaceous flora of James Ross Island (Antarctica) – preliminary report". Czech Polar Reports. 1 (2): 96–103. doi: 10.5817/CPR2011-2-9 . ISSN   1805-0697.

Further reading

• V. D. Barreda, S. Palamarczuk, and F. Medina. 1999. Palinología de la Formación Hidden Lake (Coniaciano-Santoniano), Isla James Ross, Antártida. Revista Española de Micropaleontología (31)53-72
• R. E. Molnar, A. L. Angriman, and Z. Gasparini. 1996. An Antarctic Cretaceous theropod. Memoirs of the Queensland Museum 39(3):669-674
• D. Néraudeau, A. Crame, and M. Kooser. 2000. Upper Cretaceous echinoids from James Ross Basin, Antarctica. Géobios 33(4):455-466