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. The formation contains a high diversity of graptolite fossils. Graptolite fossil taxa found include:
- Monograptus priodon
- Retiolites geinitzianus
- Stimulograptus sedgwickii
- Metaclimacograptus asejradi
- Pseudoplegmatograptus reticulatus
- Talacastograptus leanzai
- Coronograptus
- Pristiograptus
- Stimulograptus
- Pristiograptus
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): 201. doi:10.5027/andgeov50n2-3617.
- Serra, F.; Feltes, N.A.; Mango, M.J.; Henderson, M.A.; Albanesi, G.L.; Ortega, G.D.C. (2020). "Darriwilian (Middle ordovician) conodonts and graptolites from the cerro la chilca section, central precordillera, Argentina". Andean Geology. 47 (1): 125–143. doi:10.5027/andgeoV47n1-3229.
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