Sunjiagou Formation

{{Short description|Geological formation in Shanxi, China}}

{{Infobox rockunit|name=Sunjiagou Formation|map_caption=|country_ts=|region_ts=|paleocoordinates_ts=|coordinates_ts=|location_ts=|year_ts=|namedby=|namedfor=|extent=Shanxi

|country=China|region=|coordinates=|location=|map=|period=Lopingian|area=|thickness=100-200 metres|overlies=Shangshihezi Formation|underlies=Liujiagou Formation|subunits=|unitof=Shiqianfeng Group|otherlithology=|prilithology=Sandstone, Siltstone, Mudstone|type=Geological formation|caption=|imagesize=|image=|age={{fossilrange|Lopingian|Lopingian|Late Wuchiapingian-earliest Induan}}|thickness_ts=}}

The Sunjiagou Formation is a geological formation in Shanxi, China. It is of Lopingian age. The lower and middle parts of the formation consists of intensely bioturbated fine grained sandstones and thinly interbedded mudstones, deposited in a shallow-shore lake depositional environment, while the upper part consists of fine grained sandstone, siltstone and mudstone.{{Cite journal|last1=Chu|first1=Daoliang|last2=Tong|first2=Jinnan|last3=Song|first3=Haijun|last4=Benton|first4=Michael J.|last5=Bottjer|first5=David J.|last6=Song|first6=Huyue|last7=Tian|first7=Li|date=2015-06-09|title=Early Triassic wrinkle structures on land: stressed environments and oases for life|journal=Scientific Reports|language=en|volume=5|issue=1|pages=10109|doi=10.1038/srep10109|pmid=26054731|pmc=4460569|issn=2045-2322|doi-access=free}} Alongside the Naobaogou Formation, it has provided an important vertebrate fauna.