# Terrigal Formation

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Geologic formation in Australia

Terrigal Formation Stratigraphic range: Olenekian-Anisian ~248.1–244.2 Ma PreꞒ Ꞓ O S D C P T J K Pg N Terrigal, Central Coast, Australia Type Geological formation Unit of Narrabeen Group Underlies Hawkesbury Sandstone Thickness up to 330 metres (1,080 ft) Lithology Primary Sandstone and siltstone Other Claystone Location Region New South Wales Country Australia Extent Sydney Basin

The **Terrigal Formation** is a [geologic formation](/source/Geologic_formation) in the [Sydney Basin](/source/Sydney_Basin) in eastern [Australia](/source/Australia). Commonly seen in the [Central Coast](/source/Central_Coast_(New_South_Wales)) region, this stratum is up to 330 metres thick. Formed in the early to mid [Triassic](/source/Triassic),[1] it is part of the [Narrabeen Group](/source/Narrabeen_Group) of sedimentary rocks. This formation includes interbedded fine to medium-grained [sandstone](/source/Sandstone) and [siltstone](/source/Siltstone), with minor deposits of [claystone](/source/Claystone). [Hawkesbury Sandstone](/source/Hawkesbury_Sandstone) occasionally overlies the Terrigal Formation.[2][3] Numerous fossils are known from this area, including the temnospondyl amphibians *[Arenaerpeton](/source/Arenaerpeton) supinatus*[4] and *[Platycepsion](/source/Platycepsion) wilksoni.*

## See also

- [Sydney Basin](/source/Sydney_Basin)

- [Munmorah Conglomerate](/source/Munmorah_Conglomerate)

- [Newport Formation](/source/Newport_Formation)

- [Narrabeen group](/source/Narrabeen_group)

## References

1. **[^](#cite_ref-1)** ["PBDB"](https://paleobiodb.org/classic/displaySearchStrataResults?group_formation_member=Terrigal). *paleobiodb.org*. Retrieved 17 May 2025.

1. **[^](#cite_ref-Geo_2-0)** ["Terrigal Formation"](https://asud.ga.gov.au/search-stratigraphic-units/results/28255). *Geo Science Australia*. Australian Government. Retrieved 19 January 2020.

1. **[^](#cite_ref-Add_3-0)** ["Terrigal Formation"](http://adderley.net.au/geology/exhibition/04/04_03.html). *Down to Earth - Geology Exhibition*. Adderley. Retrieved 20 January 2020.

1. **[^](#cite_ref-4)** Hart, Lachlan J.; Gee, Bryan M.; Smith, Patrick M.; McCurry, Matthew R. (3 August 2023). ["A new chigutisaurid (Brachyopoidea, Temnospondyli) with soft tissue preservation from the Triassic Sydney Basin, New South Wales, Australia"](https://doi.org/10.1080%2F02724634.2023.2232829). *Journal of Vertebrate Paleontology*. [doi](/source/Doi_(identifier)):[10.1080/02724634.2023.2232829](https://doi.org/10.1080%2F02724634.2023.2232829). [hdl](/source/Hdl_(identifier)):[1959.4/104059](https://hdl.handle.net/1959.4%2F104059). [ISSN](/source/ISSN_(identifier)) [0272-4634](https://search.worldcat.org/issn/0272-4634).

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