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.[1]
| Cerro Negro Formation Stratigraphic range: Ediacaran <565 Ma | |
|---|---|
| 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 | 37°12′04.3″S 60°20′48.1″W |
| Region | Buenos Aires Province |
| Country |  Argentina |
| Extent | Río de la Plata Craton |
  Cerro Negro Formation, Argentina (Argentina) | |
Fossil content
Soft-bodied discoidal specimens resembling Aspidella are described from the formation, that has been estimated as not older than 565 Ma.[2]
References
- Arrouy et al., 2015
- Arrouy, 2016
Bibliography
- Arrouy, María Julia; Lucas V. Warren; Fernanda Quaglio; Daniel G. Poiré; Marcello Guimarães Simões; Milena Boselli Rosa, and Lucía E. Gómez Peral. 2016. Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean. Scientific Reports 6. Article number 30590. Accessed 2019-02-12.
- Arrouy, M. Julia; Daniel G. Poiré; Lucía E. Gómez Peral, and José María Canalicchio. 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. 171–189. Accessed 2019-02-12.
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