
By Patricia Barnes-Svarney, Thomas Svarney
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Additional resources for The Handy Dinosaur Answer Book, Second Edition
Example text
The first recorded description of a dinosaur bone was made in 1676 by Robert Plot (1640–1696), a professor of chemistry at the University of Oxford, England, in his book The Natural History of Oxfordshire. Although he correctly determined that it was a broken piece of a giant bone, Plot did not know the bone came from a dinosaur. Instead, he felt it belonged to a giant man or woman, citing mythical, historical, and biblical sources. In 1763, the same bone fragment was named Scrotum humanum, by R.
When the positions of the continents were plotted using this data, scientists found that there was a major movement of the continents within a relatively short period of time around the Cambrian period. The data showed that ancestral North America moved to the equator between 540 and 515 million years ago, while Gondwanaland shifted between 535 and 500 million years ago. What are the Paleozoic, Mesozoic, and Cenozoic eras? The divisions between the eras on the geologic time scale represent major changes on Earth.
There is, however, a much larger number of extinct species of amphibians: this ancient group of animals were the first vertebrates to begin exploiting terrestrial environments, where they became prey for other species. EVOLUTION OF THE DINOSAURS What amphibians are living today? The best evidence of the change from amphibian to reptile was the early reptiles’ high skulls—evidence of additional jaw muscles—and thicker egg shells. The Hylonomus still claims the prize (so far) as the oldest-known reptile and lived about 315 million years ago.