Recently, lots of dinosaurs found from the originally named Paleogene “Mangchuan Formation” of the Ruyang Basin of Henan Province form a distinct dinosaurian fauna. It is dominated by planteating gigantic to largesized sauropods, accompanying with small theropods, and hadrosaurids. The preliminary study indicates that at least 10 kinds of new dinosaurs and lots of dinosaur egg fragments, turtles, bivalves and fossil plants have been discovered.It was called the Ruyang Gigantic Sauropod Dinosaurian Fauna by L et al.. It represents a new late Early Cretaceous to early Late Cretaceous dinosaurian fauna from China. The diversity of sauropods is much higher than the previously thought. Based on microfossil assemblage features, such as charophyta, ostracods and spores and pollens, stratum characters and regional correlation, the geological age of the dinosaurbearing “Mangchuan Formation” from the Ruyang Basin is regarded to belong to mid—late Early Cretaceous. Undoubtedly, the originally assigned Eocene “Chenzhaigou Formation” and “Mangchuan Formations” of the Ruyang Basin should be long to Cretaceous, however, this still needs evidence to decide whether it belongs to mid—late Early Cretaceous or early Late Cretaceous.