La Chilca Formation
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 contain graptolite fossils.[1] Graptolite fossil species found include:[1]
- Monograptus priodon
- Retiolites geinitzianus
- Stimulograptus sedgwickii
- Metaclimacograptus asejradi
- Pseudoplegmatograptus reticulatus
- Talacastograptus leanzai
- Coronograptus sp.
- Pristiograptus sp.
- Stimulograptus sp.
- Pristiograptus sp.
References
- Lopez, Fernando Enrique; Kaufmann, Cintia (2023). "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". Andean Geology. 50 (2). doi:10.5027/andgeov50n2-3617.
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