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Stromatolites from Bolivia.

These stromatolites are from Bolivia, South America.

They occur in the Miraflores Formation, El Molino, Cerro Huañaquino, Potosí, Bolivia. The formation consists of fine-grained sandstone and sandy limestones with the stromatolites growing in what is believed to have been ancient lake systems.

Age is Late Cretaceous (approximately 70 million years)