{{Short description|Geologic formation in Australia}} {{Use Australian English|date=May 2024}} {{Infobox rockunit | name = Terrigal Formation | period = Triassic | age = [[Olenekian]]-[[Anisian]]<br>~{{fossil range|248.1|244.2}} | image = Terrigal NSW 2260, Australia - panoramio (29).jpg | imagesize = | caption = [[Terrigal]], [[Central Coast (New South Wales)|Central Coast]], [[Australia]] | type = [[Geological formation]] | prilithology = [[Sandstone]] and [[siltstone]] | otherlithology = [[Claystone]] | unitof = [[Narrabeen Group]] | subunits = | underlies = [[Hawkesbury Sandstone]] | overlies = | thickness = up to {{Convert|330|m|ft|-1}} | area = | map = | map_caption = <!----Location----> | location = | coordinates = | region = [[New South Wales]] | country = Australia | extent = [[Sydney Basin]] <!--Type section---> | namedfor = <!--Usually a nearby town--> | namedby = <!--Author of defining paper--> | year_ts = <!--Year of definition--> | location_ts = <!--Place,mountain,...--> | coordinates_ts = <!--Geographic coordinates--> | paleocoordinates_ts = <!--Paleocoordinates--> | region_ts = <!--Region of type section--> | country_ts = <!--Country of type section--> | thickness_ts = <!--Thickness at type section--> }} {{Use dmy dates|date=July 2019}}
The '''Terrigal Formation''' is a [[geologic formation]] in the [[Sydney Basin]] in eastern [[Australia]]. Commonly seen in the [[Central Coast (New South Wales)|Central Coast]] region, this stratum is up to 330 metres thick. Formed in the early to mid [[Triassic]],<ref>{{Cite web |title=PBDB |url=https://paleobiodb.org/classic/displaySearchStrataResults?group_formation_member=Terrigal |access-date=2025-05-17 |website=paleobiodb.org}}</ref> it is part of the [[Narrabeen Group]] of sedimentary rocks. This formation includes interbedded fine to medium-grained [[sandstone]] and [[siltstone]], with minor deposits of [[claystone]]. [[Hawkesbury Sandstone]] occasionally overlies the Terrigal Formation.<ref name=Geo>{{cite web|title=Terrigal Formation|url=https://asud.ga.gov.au/search-stratigraphic-units/results/28255|work=Geo Science Australia|publisher=Australian Government|access-date=January 19, 2020}}</ref><ref name=Add>{{cite web|title=Terrigal Formation|url=http://adderley.net.au/geology/exhibition/04/04_03.html|work=Down to Earth - Geology Exhibition|publisher=Adderley|access-date=January 20, 2020}}</ref> Numerous fossils are known from this area, including the temnospondyl amphibians ''[[Arenaerpeton]] supinatus''<ref>{{Cite journal |last1=Hart |first1=Lachlan J. |last2=Gee |first2=Bryan M. |last3=Smith |first3=Patrick M. |last4=McCurry |first4=Matthew R. |date=2023-08-03 |title=A new chigutisaurid (Brachyopoidea, Temnospondyli) with soft tissue preservation from the Triassic Sydney Basin, New South Wales, Australia |journal=Journal of Vertebrate Paleontology |language=en |doi=10.1080/02724634.2023.2232829 |issn=0272-4634|doi-access=free |hdl=1959.4/104059 |hdl-access=free }}</ref> and ''[[Platycepsion]] wilksoni.''
== See also == * [[Sydney Basin]] * [[Munmorah Conglomerate]] * [[Newport Formation]] * [[Narrabeen group]]
== References == {{Reflist}}
[[Category:Geologic formations of Australia]] [[Category:Triassic Australia]] [[Category:Sandstone formations]] [[Category:Geology of New South Wales]] [[Category:Terrigal]]
{{Australia-geology-stub}} [[Category:Olenekian Stage]] [[Category:Anisian Stage]]