Dinosaur fossils have been found on every continent of Earth, including Antarctica. Fossils help us understand what the dinosaurs were like. Information can be gathered from sources such as fossilized bones, footprints, stomach stones, feces, internal organs, soft tissues, eggs and feathers.Fossils of Alvarezsaurus and Choristodera will help us to compare them, group them and also know Facts about Alvarezsaurus and Choristodera. Location of Alvarezsaurus and Choristodera provides us the information about place where fossils of these dinosaurs were found. The Alvarezsaurus was present in 86 - 83 million years ago. The era of its living is Cretaceous. The fossils of the same where found in the year of 1991-01-01 (1991). The discovery was named by José Bonaparte . On the other hand, the living era of Choristodera is Middle Jurassic. Approx 165 - 20 million years ago they have known to have existed. The remains were found in the year of 1884-01-01 (1884).
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