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La Chilca Formation
Geologic formation in Argentina From Wikipedia, the free encyclopedia
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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
- Retiolites geinitzianus
- Stimulograptus sedgwickii
- Metaclimacograptus asejradi
- Pseudoplegmatograptus reticulatus
- Talacastograptus leanzai
- Coronograptus
- Pristiograptus
- Stimulograptus
- Pristiograptus
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References
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