Agrio Formation, Geological formation in Mendoza Province, Argentina.
The Agrio Formation is a geological sequence in Mendoza Province made up of thick layers of dark shale mixed with limestone and sandstone. These rocks formed in an ancient sea and today reveal important information about how this region changed over geological time.
The formation developed approximately 130 to 120 million years ago when this area was submerged beneath a vast ancient sea. The sediments and fossils that accumulated record the conditions and life that existed in this ocean environment.
Scientists from multiple universities conduct research at this site to understand the geological evolution of the Andean region through fossil analysis.
The site is accessible through various routes across Mendoza Province, with the Cuesta del Chihuido area being particularly open for exploration. Visitors should prepare for dry climate and exposed terrain, requiring basic gear and physical readiness.
The layers contain a remarkably diverse collection of microfossils including tiny calcareous discs, foraminifers, and ostracods. These microscopic remains allow scientists to reconstruct the conditions and biodiversity of the ancient sea with great precision.
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