# Argun Formation

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For the rock unit in Transbaikalia and Mongolia, see [Argun terrane](/source/Argun_terrane).

The **Argun Formation** is the name of geological formation, formed in Crimea and [Chita](/source/Chita,_Zabaykalsky_Krai), Russia. [1] It formed in early Cretaceus, appeared around 125.45 - 122.46 Ma, and ended in Miocene, ~23.03 - 15.97 Ma. Its lithology is characterized as shale in Crimea and siliclastic in Pad Semen (near Chita).[2]

## Fossil content

The formation contains mainly remains of fossil insects, mainly beetles:

- *Archeraphidia baisensis*
- *[Acmaeoderimorpha emersa](/source/Parathyreinae)*
- *[Antemnacrassa geminata](/source/Aclopinae)*
- *[Brochocoleus minor](/source/Brochocoleus)*
- *[Cacopsylla agellialta](/source/Cacopsylla)*
- *C. lapidea*
- *C. popovi*
- *C. taurica*
- *Cretohexura coylei*
- *Cretobestiola communis*
- *[Cretothyrea optanda](/source/Cretothyrea)*
- *Cretoglaphyrus olenguicus*
- *C. zherikhini*
- *C. calvescens*
- *C. leptopterus*
- *C. transbaikalicus*
- *Cretolucanus longus*
- *C. ordinarius*
- *C. sibericus*
- *[Cionocoleus sibiricus](/source/Cionocoleus)*
- *[Dolichoderus tavridus](/source/Dolichoderus)*
- *D. taurica*
- *D. tauricus*
- *Lithoscarabaeus baissensis*
- *[Metabuprestium cuneomaculatum](/source/Metabuprestium)*
- *Myangadina tetrops*
- *[Prototrox transbaikalicus](/source/Prototrox)*
- *[Priacma striata](/source/Priacma)*
- *Prosusumania semenica*
- *Proteroscarbaeus yeni*
- *Pamparaphilius semen*
- *Trematothorax ingodensis*
- *Zygadenia semen*
- *Z. sibirica*
- *Z. sinitzae*
- *[Irenichthys sp.](/source/Irenichthys)*
- [Archostemata indet.](/source/Archostemata)
- [Cupedidae indet.](/source/Cupedidae)
- [Prototroginae indet.](/source/Prototrox)

## See also

- [Argun terrane](/source/Argun_terrane)

## References

1. ["PBDB Strata Results"](https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Argun&group_formation_member=Argun). *paleobiodb.org*

1. ["Mindat.org"](https://www.mindat.org/paleo_strat.php?id=1075). *www.mindat.org*

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Adapted from the Wikipedia article [Argun Formation](https://en.wikipedia.org/wiki/Argun_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Argun_Formation?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.