La Chilca Formation
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La Chilca Formation (Spanish: 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.[1] The formation contains a high diversity of graptolite fossils.[1][2] Graptolite fossil taxa found include:[1]
- Monograptus priodon
- Stimulograptus
- Pseudoplegmatograptus reticulatus
- Stimulograptus sedgwickii
- Talacastograptus leanzai
- Retiolites geinitzianus
- Coronograptus
- Metaclimacograptus asejradi
- Pristiograptus Pristiograptus
References
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