Earth:Cerro Negro Formation

Cerro Negro Formation Stratigraphic range: Ediacaran <565 Ma PreЄ Є O S D C P T J K Pg N ↓
Type	Formation
Unit of	La Providencia Group  Tandilia System
Underlies	Balcarce Formation
Overlies	Sierra Bayas Group
Thickness	>150 m (490 ft)
Lithology
Primary	Shale, sandstone
Other	Marl
Location
Coordinates
Region	Buenos Aires Province
Country	Argentina
Extent	Río de la Plata Craton
Cerro Negro Formation (Argentina)

The Cerro Negro Formation is a sedimentary formation of Ediacaran age in Buenos Aires Province, Argentina. The formation crops out along the Tandilia System, a chain of hills made up by of ancient rocks. Together with the formations of the underlying Sierra Bayas Group it is contains the oldest sedimentary formations in Argentina that have not been subject to significant metamorphism or deformation. In 2015 a complete revision of the formation was proposed.

Fossil content

Soft-bodied discoidal specimens resembling Aspidella are described from the formation, that has been estimated as not older than 565 Ma.

See also

• Dyke swarms of Tandil and Azul
• Puncoviscana Formation
• Nama Group

References

Bibliography

• Arrouy, María Julia; Warren, Lucas V.; Quaglio, Fernanda; Poiré, Daniel G.; Guimarães Simões, Marcello; Boselli Rosa, Milena; Gómez Peral, Lucía E. (2016), "Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean", Scientific Reports 6, doi:10.1038/srep30590, PMID 27460966, PMC 4962044, Bibcode: 2016NatSR...630590A, https://www.researchgate.net/publication/305681062, retrieved 2019-02-12 
• Arrouy, M. Julia; Poiré, Daniel G.; Gómez Peral, Lucía E.; Canalicchio, José María (2015), "Sedimentología y estratigrafía del Grupo La Providencia (nom. nov.): cubierta superior neoproterozoica, Sistema de Tandilia, Argentina", Latin American Journal of Sedimentology and Basin Analysis 22 (2): 171–189, http://www.scielo.org.ar/pdf/lajsba/v22n2/v22n2a04.pdf, retrieved 2019-02-12