Portezuelo Formation, Geological formation in Mendoza Province, Argentina.
The Portezuelo Formation is a geological unit in Mendoza Province composed of alternating layers of sandstone and siltstone that reach 95 to 130 meters in thickness. These deposits span across northern Patagonia and represent sediments laid down over millions of years.
This geological unit formed during the Late Cretaceous, between the Late Turonian and Early Coniacian stages, through continuous sedimentation in the Neuquén Basin. The layers preserve a record from when large dinosaurs inhabited southern South America.
Scientists from multiple research institutions regularly conduct field studies at the formation to examine fossil remains and analyze sedimentary patterns.
This formation is accessible at several locations across the region, with the driest months offering the best conditions for visiting. Wear sturdy footwear and bring sun protection, as the sites are exposed and largely without shelter.
This formation holds extensive paleosols, which are fossilized ancient soils that directly reveal environmental conditions from millions of years ago. These buried soil layers are uncommon and allow scientists to reconstruct how the land and climate looked in the distant past.
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