Type Formation Other Marl Region Buenos Aires Province Primary Slate, Sandstone | Underlies Balcarce Formation Country Argentina Overlies Sierra Bayas Group | |
Cerro Negro Group 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.
References
Cerro Negro Formation Wikipedia(Text) CC BY-SA