# Iwaki Formation

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{{Infobox rockunit
| name           = Iwaki Formation
| period         = Eocene
| age            = Eocene–early Oligocene
| image          = 
| imagesize      = 
| caption        = 
| type           = [Geological formation](/source/Geological_formation)
| prilithology   = 
| otherlithology = 
| unitof         =[Shiramizu Group](/source/Shiramizu_Group) 
| subunits       = 
| underlies      = 
| overlies       =[Unconformity](/source/Unconformity) with the [Tamayama Formation](/source/Tamayama_Formation) 
| thickness      = 
| area           = 
| map            = 
| map_caption    = 
<!----Location---->
| location       = [Iwaki, Fukushima](/source/Iwaki%2C_Fukushima)
| coordinates    = {{Coord|37|06|54.2|N|140|50|26.6|E|display=title, inline}}
| region         = 
| country        = [Japan](/source/Japan)
| extent         = 
<!--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-->
}}
{{short description|Geologic formation in Japan}}
{{Use dmy dates|date=November 2019}}
The '''Iwaki Formation''' is a [palaeontological](/source/paleontology) formation located in [Iwaki, Fukushima](/source/Iwaki%2C_Fukushima), [Japan](/source/Japan). It dates to [Eocene](/source/Eocene) and early [Oligocene](/source/Oligocene) periods. The formation contains three families of [Artiodactyla](/source/Artiodactyla)–[Anthracotheriidae](/source/Anthracotheriidae), [Entelodontidae](/source/Entelodontidae), and [Hypertragulidae](/source/Hypertragulidae).<ref>{{cite journal|title=Paleogene mammals from the Iwaki Formation in Japan: Their implications for the geologic age and paleobiogeography of this formation|doi=10.1016/j.jseaes.2015.03.049|work=Journal of Asian Earth Sciences|date=15 August 2015}}</ref>

==Paleofauna==
*[Anthracotheriidae](/source/Anthracotheriidae) indet.
*[Entelodontidae](/source/Entelodontidae) indet. 
*[Hypertragulidae](/source/Hypertragulidae) indet.

==See also==
* [List of fossil sites](/source/List_of_fossil_sites)

==Further reading==
* {{aut|Vickers-Rich, Patricia & Rich, Thomas Hewett}} (1993); ''Wildlife of Gondwana''. Reed. {{ISBN|0-7301-0315-3}}

==References==
{{reflist}}

Category:Geologic formations of Japan
Category:Paleogene System of Asia
Category:Paleogene Japan
Category:Oligocene Series
Category:Oligocene paleontological sites
Category:Paleontology in Japan

{{Japan-geologic-formation-stub}}

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Adapted from the Wikipedia article [Iwaki Formation](https://en.wikipedia.org/wiki/Iwaki_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Iwaki_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.