Hidden Lake Formation Explained

Hidden Lake Formation
Type:	Geological formation
Age:	Coniacian^[1]
Period:	Santonian
Prilithology:	Sandstone
Otherlithology:	Siltstone
Namedfor:	Hidden Lake
Region:	James Ross Island, James Ross Island group
Country:	Antarctica
Coordinates:	-63°N -57°W
Paleocoordinates:	-63.1°N -63.9°W
Unitof:	Gustav Group
Underlies:	Santa Marta Formation
Overlies:	Whisky Bay Formation
Map:	Wfm antarctic peninsula islands.png

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.
• Palaeophycus sp.
• Planolites sp.

Flora

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

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

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

Notes and 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. en. 258. 1. 7–19. 10.1144/GSL.SP.2006.258.01.02. 2006GSLSP.258....7C . 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. ." pp. 517–607.
3. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=47823 Hidden Lake
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. en. 26. 4. 371–376. 10.1017/S095410201300076X. 0954-1020. free. 2014AntSc..26..371S .
5. Kvaček. Jiří. Sakala. Jakub. 2011-06-01. Late Cretaceous flora of James Ross Island (Antarctica) – preliminary report. Czech Polar Reports. en. 1. 2. 96–103. 10.5817/CPR2011-2-9. 1805-0697. free.