During his several expeditions in 1922-28, Roy Chapman Andrews discovered thousands of dinosaur skeletons and eggs. However the most important of all was the skulls of Zalamdalestes which was the first collection of early mammals. It was a great contribution to the study of mammalian radiation and human origins just like Mr.Osborn’s great expectation. One important discovery is fossilized eggs belonged to dinosaurs which was the first time human beings saw dinosaur eggs as a whole in 1923.
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