Lisandro Formation, Geological formation in Mendoza Province, Argentina.
The Lisandro Formation is a geological layer in Mendoza Province made up of reddish siltstone and claystone beds ranging from 35 to 75 meters thick. The rocks spread across the landscape in distinct strata that reveal different mineral compositions and depositional patterns.
The formation was scientifically defined in 1938 and initially classified as the Cerro Lisandro Member within the broader Río Limay Formation. Later researchers recognized it as a distinct stratigraphic unit with its own defining characteristics.
The formation holds extensive collections of Late Cretaceous fossils, including freshwater bivalves, turtles, fish, crocodilians, and various dinosaur specimens from ancient Argentina.
Visitors and researchers can view the formation at several locations in protected areas across Mendoza Province. Access is through marked routes, and it helps to work with local guides or institutions to learn the exact sites and any current access conditions.
The sedimentary layers preserve traces of ancient swamps and wetlands from roughly 93 million years ago. These damp environments allowed organic material to accumulate and fossilize within the rocks over deep time.
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