Adamantina Formation, Geological formation in São Paulo, Brazil
The Adamantina Formation displays yellow to reddish sandstone layers across western São Paulo with varying sedimentary patterns throughout the exposed sections. These rock layers reveal the geological processes that unfolded over millions of years.
This formation originated during the Late Cretaceous, roughly 88 to 68 million years ago, within the Bauru Basin as sediment accumulated layer by layer. This geological event was part of a major phase of basin development across the region.
The formation draws researchers and fossil enthusiasts who come to observe and study the rock layers in their natural state. This scientific interest reflects how geology connects people to Earth's deep past.
You can view the formation at several locations across the region where rock exposures are visible from roads or natural outcrops. Some sites may require permission or local guidance to visit safely and responsibly.
Fossil discoveries here show that dinosaurs like Adamantisaurus and Arrudatitan once roamed this region. Alongside these long-necked reptiles, early crocodiles and amphibians also left their remains trapped in the sediments.
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