The very first dinosaur fossil was a thigh bone found in the year 1787 by Dr. Caspar Wistar in the US. The study of Maiasaura fossils gives us an image of the dinosaur and also tells us a lot about the Maiasaura Characteristics.In early 19th Century, fossils found were formally recognized as the dinosaurs. Fossils of Maiasaura include : The generic name refers to Marion Brandvold's discovery in 1978 of a nest with remains of eggshells and babies too large to be hatchlings . Choteau Maiasaura remains are found in higher strata than their Two Medicine River counterparts .The dinosaurs first came into existence in the Triassic period of the Mesozoic era which was about 248 to 65 million years ago. The time period in which Maiasaura lived is Cretaceous and was present 76.7 million years ago. Maiasaura discovery is credited to Laurie Trexler. It was named and described in the year 1979-01-01 (1979).