# Hidden Lake Formation
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{{short description|Geologic formation in Antarctica}}
{{Infobox rockunit
| name = Hidden Lake Formation
| image =
| caption =
| type = [Geological formation](/source/Geological_formation)
| age = [Coniacian](/source/Coniacian)[{{Cite journal|last1=Crame|first1=J. A.|last2=Pirrie|first2=D.|last3=Riding|first3=J. B.|date=2006|title=Mid-Cretaceous stratigraphy of the James Ross Basin, Antarctica|url=http://sp.lyellcollection.org/lookup/doi/10.1144/GSL.SP.2006.258.01.02|journal=Geological Society, London, Special Publications|language=en|volume=258|issue=1|pages=7–19|doi=10.1144/GSL.SP.2006.258.01.02|bibcode=2006GSLSP.258....7C |issn=0305-8719|url-access=subscription}}]
| period = Santonian
| prilithology = [Sandstone](/source/Sandstone)
| otherlithology = [Siltstone](/source/Siltstone)
| namedfor = Hidden Lake
| namedby =
| region = [James Ross Island](/source/James_Ross_Island), [James Ross Island group](/source/James_Ross_Island_group)
| country = [Argentine Antarctica](/source/Argentine_Antarctica), [British Antarctic Territory](/source/British_Antarctic_Territory), [Chilean Antarctic Territory](/source/Chilean_Antarctic_Territory)
| coordinates = {{coord|63.0|S|57.0|W|display=inline,title}}
| paleocoordinates = {{coord|63.1|S|63.9|W|display=inline}}
| unitof = [Gustav Group](/source/Gustav_Group)
| subunits =
| underlies = [Santa Marta Formation](/source/Santa_Marta_Formation)
| overlies = [Whisky Bay Formation](/source/Whisky_Bay_Formation)
| thickness =
| extent =
| area =
| map = Wfm antarctic peninsula islands.png
| map_caption = Map of James Ross Island group
James Ross Island is number 2
}}
The '''Hidden Lake Formation''' is a [Late Cretaceous](/source/Late_Cretaceous) geologic [formation](/source/Formation_(geology)) in [Antarctica](/source/Antarctica). The [sandstone](/source/sandstone)s and [siltstone](/source/siltstone)s of the formation were deposited in a [deltaic](/source/river_delta) [environment](/source/depositional_environment).
Indeterminate [megalosaur](/source/megalosaur) remains have been recovered from it.[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.] Also many plant fossils and [ichnofossil](/source/ichnofossil)s of ''[Planolites sp.](/source/Planolites)'' and ''[Palaeophycus sp.](/source/Palaeophycus)'' have been found in the formation.[[https://paleobiodb.org/classic/displayCollResults?collection_no=47823 Hidden Lake] at [Fossilworks](/source/Fossilworks).org]
==Paleofauna==
*[Megalosauroidea](/source/Megalosauroidea) indet.[{{Cite journal|last1=Sakala|first1=Jakub|last2=Vodrážka|first2=Radek|date=August 2014|title=A new species of Antarctoxylon : a contribution to the early angiosperm ecosystem of Antarctica during the late Cretaceous|journal=Antarctic Science|language=en|volume=26|issue=4|pages=371–376|doi=10.1017/S095410201300076X|issn=0954-1020|doi-access=free|bibcode=2014AntSc..26..371S }}]
* ''[Dicotylophyllum](/source/Dicotylophyllum)''[{{Cite journal|last1=Kvaček|first1=Jiří|last2=Sakala|first2=Jakub|date=2011-06-01|title=Late Cretaceous flora of James Ross Island (Antarctica) – preliminary report|url=https://journals.muni.cz/CPR/article/view/12809|journal=Czech Polar Reports|language=en|volume=1|issue=2|pages=96–103|doi=10.5817/CPR2011-2-9|issn=1805-0697|doi-access=free}}]
* ''[Elatocladus](/source/Elatocladus)'' cf. ''heterophylla''