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Allosaurus |
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| Flesch-Kincaid grade level: | 8.28 |
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Allosaurus
By Sharon Fabian |
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1 In 1883, scientists were digging for dinosaur bones in the western part of the United States, in an area named the Morrison Formation. Since the first dinosaur fossils were found there in 1877, it had become one of the best places in the world to hunt for evidence of dinosaurs. In the late Jurassic period, the area now called the Morrison Formation was a swampy lowland. Rivers there would flood and leave mud and silt that buried and preserved the bones of dinosaurs that had died. It is named for the town of Morrison, Colorado, but the area is huge, covering states from New Mexico to Canada. So finding new dinosaur bones there was not easy.