Mesón Group () is a Cambrian to Early Ordovician sedimentary group located in the Argentine Northwest and nearby parts of Bolivia. The group members rest unconformably on top of the Ediacaran–Cambrian Puncoviscana Formation. According to G.F. Aceñolaza, the Mesón Basin the sedimentary basin in which the Méson Group was deposited was located between the Arequipa and Río de la Plata Cratons.
Stratigraphy The Mesón Group comprises three formations: Chahualmayoc Formation at the top, Lizoite Formation at the base and Campanario Formation in-between.Mángano, M. G., & Buatois, L. A. (2000). Ichnology, sedimentary dynamics, and sequence stratigraphy of the Mesón Group: A Cambrian macrotidal shallow-marine depositional system in northwest Argentina. Cambrian from the southern edge, Instituto Superior de Correlación Geológica, Miscelánea, 6, 109–110. The group is composed of sandstones, siltstones and limestones.Grupo Meson Quartzite Fm., Alto de la sierra, Argentina at Fossilworks.orgGrupo Meson Quartzite Fm., Sapagua (Humamuaco), Argentina at Fossilworks.org
Fossil content The group has provided fossils of:
Trilobites Asaphellus sp. Notopeltis sp.
Other Macrocystella sp.
References
Further reading F. G. Acenolaza. 1986. El genero Macrocystella (Cystoidea) en el Tremadociano de Salta y Jujuy. Actas del IV congreso Argentino de paleontologia y bioestratigrafia - Simposio: Bioestratigrafia del Paleozoico Inferior. Ed. A. Cuerda. 1:133-137