San Juan Formation, Argentina

San Juan Formation Stratigraphic range: Ordovician
Type	Formation
Overlies
Thickness	300–400 m (980–1,310 ft)
Lithology
Primary	Limestone, marl
Other	Mudstone
Location
Coordinates	30°18′S 68°12′W / 30.3°S 68.2°W / -30.3; -68.2Coordinates: 30°18′S 68°12′W / 30.3°S 68.2°W / -30.3; -68.2
Approximate paleocoordinates	35°24′S 132°48′W / 35.4°S 132.8°W / -35.4; -132.8
Region	San Juan Province
Country	Argentina
Extent	Precordillera
Type section
Named for	San Juan Province
San Juan Formation, Argentina (Argentina)

The San Juan Formation (Spanish: Formación San Juan) is a geologic formation in Argentina. The formation comprising limestones, mudstones and marls was deposited in a shallow marine reefal environment and preserves many fossils dating back to the Ordovician period. The formation overlies the and crops out in the Precordillera of San Juan Province.^[1]

See also[]

• Geological history of the Precordillera terrane
• Mesón Group

References[]

Further reading[]

• J. L. Benedetto. 2012. Gatosella, a new basal plectambonitoid brachiopod with undercut cardinal process from Middle Ordovician limestones of the Precordillera terrane, Argentina. Journal of Systematic Palaeontology 10(3):435-443
• M. G. Carrera. 2006. The new genus Multispongia (Porifera) from the Lower Ordovician limestones of the Argentine Precordillera. Ameghiniana 43(2):493-498
• M. G. Carrera. 2000. Epizoan-sponge Interactions in the Early Ordovician of the Argentine Precordillera. Palaios 15:261-272
• B. Kröger, M. S. Beresi, and E. Landing. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283

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