# La Chilca Formation

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{{Short description|Geologic formation in Argentina}}
'''La Chilca Formation''' ({{langx|es|Formación La Chilca}}) is a [geological formation](/source/geological_formation) that [crops out](/source/outcrop) in the [Precordillera](/source/Precordillera) of [San Juan Province](/source/San_Juan_Province%2C_Argentina), Argentina. Rocks of the formation are mostly [shale](/source/shale) and [sandstone](/source/sandstone) that deposited during the [Ordovician](/source/Ordovician) and [Silurian](/source/Silurian) periods.<ref name=Newins/> The formation contains a high diversity of  [graptolite](/source/graptolite) fossils.<ref name=Newins>{{Cite journal |title=New insights on the Silurian graptolite biostratigraphy of the La Chilca Formation, Poblete Norte section, Central Precordillera of San Juan, Argentina: faunal replacement and paleoenvironmental implications |journal=[Andean Geology](/source/Andean_Geology) |url=https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062023000200201&lng=en&nrm=iso&tlng=en |last1=Lopez |first1=Fernando Enrique |issue=2 |volume=50 |last2=Kaufmann |first2=Cintia |doi=10.5027/andgeov50n2-3617 |year=2023|page=201 |doi-access=free }}</ref><ref name=serra>{{cite journal|last1=Serra|first1=F.|last2=Feltes|first2=N.A.|last3=Mango|first3=M.J.|last4=Henderson|first4=M.A.|last5=Albanesi|first5=G.L.|last6=Ortega|first6=G.D.C.|year=2020|title=Darriwilian (Middle ordovician) conodonts and graptolites from the cerro la chilca section, central precordillera, Argentina|journal=Andean Geology|volume=47|issue=1|pages=125–143|doi=10.5027/andgeoV47n1-3229|doi-access=free}}</ref> Graptolite fossil taxa found include:<ref name=Newins/>
{{linked species list
|Monograptus priodon|
|Retiolites geinitzianus|
|Stimulograptus sedgwickii|
|Metaclimacograptus asejradi|
|Pseudoplegmatograptus reticulatus|
|Talacastograptus leanzai|
|Coronograptus|
|Pristiograptus|
|Stimulograptus|
|Pristiograptus|
}}

==References==
{{reflist}}

{{coord missing|Argentina}}

Category:Geology of San Juan Province, Argentina
Category:Fossiliferous stratigraphic units of South America
Category:Ordovician Argentina
Category:Silurian Argentina
Category:Shale formations
Category:Sandstone formations
Category:Geologic formations of Argentina

{{Argentina-geologic-formation-stub}}

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