Chañares Formation, Geological formation in La Rioja Province, Argentina.
The Chañares Formation is a geological formation in La Rioja Province made up of layered mudstones, siltstones, and sandstones in bluish-grey tones. These rock layers, roughly 70 meters thick, hold many fossils from ancient animals that once lived in the region.
This rock formation developed during the early Carnian stage of the Late Triassic period, roughly 237 to 234 million years ago. Scientists determined this age using analysis methods that examined uranium and lead in the rocks.
Paleontologists worldwide travel to this formation for research, making it a central location for understanding South American prehistoric ecosystems.
Access to this formation is restricted and requires special permits, as it sits within Talampaya National Park. The remote location requires good planning and preparation before visiting.
In several spots throughout this formation lie coprolites, which are fossilized animal droppings concentrated in large quantities at specific sites. These finds reveal where animals established their latrines millions of years ago and tell much about their eating habits.
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