La Chilca Formation

{{Short description|Geologic formation in Argentina}} '''La Chilca Formation''' ({{langx|es|Formación La Chilca}}) is a geological formation that crops out in the Precordillera of San Juan Province, Argentina. Rocks of the formation are mostly shale and sandstone that deposited during the Ordovician and Silurian periods.<ref name=Newins/> The formation contains a high diversity of 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 |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}}

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