# Xiushan Formation
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> Source: https://en.wikipedia.org/wiki/Xiushan_Formation
> Source revision: 1340591689
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{{Short description|Geologic formation in China}}
{{Infobox rockunit
| name = Xiushan Formation
| image =
| caption =
| type = [Geological formation](/source/Geological_formation)
| age = {{fossilrange|Llandovery}}
| prilithology =
| otherlithology =
| namedfor = [Xiushan County](/source/Xiushan_County)
| namedby =
| region = [Southern China](/source/Southern_China)
| country = [China](/source/China)
| coordinates =
| unitof =
| subunits =
| underlies =
| overlies =
| thickness =
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|period=Silurian}}
The '''Xiushan Formation''' is a [palaeontological](/source/paleontology) formation located in [China](/source/China). It dates to the Lower [Silurian](/source/Silurian) period. Studies of [conodont](/source/conodont)s found in the formation suggests the lower member and main part of the upper member correspond to the ''[Pterospathodus](/source/Pterospathodus) eopennatus'' Superbiozone, whereas the top of the upper member likely correlates with the ''Pterospathodus celloni'' Superbiozone.[{{Cite journal |last1=Chen |first1=Zhongyang |last2=Wang |first2=Chengyuan |last3=Fan |first3=Ru |date=2016-02-16 |editor-last=Jin |editor-first=Jisuo |title=Restudy of the Llandovery conodont biostratigraphy in the Xiushan area, Chongqing City, China |url=http://www.nrcresearchpress.com/doi/10.1139/cjes-2015-0189 |journal=Canadian Journal of Earth Sciences |language=en |volume=53 |issue=7 |pages=651–659 |doi=10.1139/cjes-2015-0189 |bibcode=2016CaJES..53..651C |issn=0008-4077|url-access=subscription }}]
==Fossil content==
===Cartilaginous fish===
{| class="wikitable" align="center"
|-
! colspan="6" align="center" | [Cartilaginous fish](/source/Cartilaginous_fish) reported from the Xiushan Formation
|-
! Genus !! Species !! Presence
! Material !! Notes !! Images
|-
|''[Chenolepis](/source/Chenolepis)''
|''C. asketa''
|[Guizhou](/source/Guizhou).[{{Cite journal |last1=Andreev |first1=Plamen S. |last2=Zhao |first2=Wenjin |last3=Wang |first3=Nian-Zhong |last4=Smith |first4=Moya M. |last5=Li |first5=Qiang |last6=Cui |first6=Xindong |last7=Zhu |first7=Min |last8=Sansom |first8=Ivan J. |date=2020-02-13 |editor-last=Wong |editor-first=William Oki |title=Early Silurian chondrichthyans from the Tarim Basin (Xinjiang, China) |journal=PLOS ONE |language=en |volume=15 |issue=2 |article-number=e0228589 |doi=10.1371/journal.pone.0228589 |issn=1932-6203 |pmc=7018067 |pmid=32053606 |bibcode=2020PLoSO..1528589A |doi-access=free }}]
|Scales.[{{Cite journal |last1=Zhang |first1=Yumeng |last2=Li |first2=Xutong |last3=Shan |first3=Xianren |last4=Lin |first4=Xianghong |last5=Tan |first5=Kai |last6=Li |first6=Qiang |last7=Zhao |first7=Wenjin |last8=Tang |first8=Lizhou |last9=Zhu |first9=Min |last10=Gai |first10=Zhikun |date=2023-06-19 |title=The first galeaspid fish (stem-gnathostomata) from the Silurian Xiushan formation of Hunan Province, China |url=https://www.tandfonline.com/doi/full/10.1080/08912963.2023.2225083 |journal=Historical Biology |language=en |pages=1–12 |doi=10.1080/08912963.2023.2225083 |s2cid=259469524 |issn=0891-2963|url-access=subscription }}]
|
| A [galeaspid](/source/Galeaspida).
|
|-
|}
===Invertebrates===
====Eurypterids====
{| class="wikitable" align="center"
|-
! colspan="6" align="center" | [Eurypterid](/source/Eurypterid)s reported from the Xiushan Formation
|-
! Genus !! Species !! Presence
! Material !! Notes !! Images
|-
|''[Terropterus](/source/Terropterus)''
|''T. xiushanensis''
|[Xiushan](/source/Xiushan_Tujia_and_Miao_Autonomous_County).[{{Cite journal |last1=Wang |first1=Han |last2=Dunlop |first2=Jason |last3=Gai |first3=Zhikun |last4=Lei |first4=Xiaojie |last5=Jarzembowski |first5=Edmund A. |last6=Wang |first6=Bo |date=November 2021 |title=First mixopterid eurypterids (Arthropoda: Chelicerata) from the Lower Silurian of South China |url=https://linkinghub.elsevier.com/retrieve/pii/S2095927321005004 |journal=Science Bulletin |language=en |volume=66 |issue=22 |pages=2277–2280 |doi=10.1016/j.scib.2021.07.019|pmid=36654455 |bibcode=2021SciBu..66.2277W |url-access=subscription }}]
|Several specimens.