Maiasaura peeblesorum lived 80-65 million years ago, in the late Cretaceous period, near the end of the Mesozoic Era. The landscape that Maiasaura peeblesorum lived in was very different from anything on earth today. Global temperatures were warmer than they are now, and there was less seasonal variation in temperatures. There were no polar ice caps, and sea levels were higher, which means that there was less dry land exposed than today. Maiasaura peeblsorum lived in what is today North America, but the landscape was very different. Active volcanos erupted regularly, and the continents were in different positions than they are now. The Mesozoic era followed a mass extinction known as the Permian extinction, which left room for huge numbers of new organisms to evolve, including Maiasaura peeblesorum (Cole 1996).

    The first fossils of Maiasaura peeblesorum were found in Montana, U.S.A. More were found in western Canada and the U.S.A., and were discovered by Jack Horner and RChoteau county, montana: near the Two Medicine Formation where Maiasaura peeblesorum was found.obert Makela (Weishampel 2004).
It is thought that the dinosaurs migrated north and south with the seasons to find food. They traveled in herds, possibly of up to ten thousand (Weishampel 2004). Maiasaura peeblesorum most likely foraged in thick forests, composed of mostly gymnosperms, or ferns with some early angiosperms, or flowering plants, as well. Most Maiasaura peeblesorum fossils are found inland of ancient coastlines, and many are found preserved by volcanic ash, indicating that some of the environments that Maiasaura peeblesorum lived in contained active volcanoes (Hamilton 2010).

    To see how Maiasaura moved around this habitat and also how they grew please visit the Form and Function page! 

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