The Quebrada Monardes Formation is a geological formation in Chile dating back to the Early Cretaceous. It was deposited in warm, arid to semi-arid conditions. One portion (the Codocedo Limestone Member) preserves a perennial salt lake covering at least 1,500 square kilometres (580 sq mi); this lake dried up, leaving a large area of mudflats. Fossils of iguanodontian dinosaurs and ctenochasmatid pterosaurs have been found in the formation.
See also List of dinosaur-bearing rock formations List of pterosaur-bearing stratigraphic units
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