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Dictionary of Dinosaurs: an illustrated A to Z of every dinosaur ever discovered Hardcover – October 9, 2018
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From the Publisher
Welcome to this book!
In these pages, you will find every dinosaur that has ever been discovered. Read on to learn more about the prehistoric world.
Dinosaurs lived in the Mesozoic Era. Scientists divide the Mesozoic Era into three periods: the Triassic, Jurassic and Cretaceous.
Triassic Period (250–200 million years ago)
During the Triassic Period, all the continents were part of a single land mass called Pangaea. This meant that there weren’t many differences between the animals or plants found in different areas. The climate was relatively hot and dry, and much of the land was covered with large deserts. It was in this environment that the reptiles known as dinosaurs first evolved. Towards the end of the Triassic, a series of earthquakes and volcanic eruptions caused Pangaea to slowly begin to break into two. There was a mass extinction – but scientists are not sure why. Many large land animals were wiped out but the dinosaurs survived, giving them the opportunity to evolve into a wide variety of forms and increase in number.
Jurassic Period (200–145 million years ago)
The single land mass, Pangaea, continued to split into two, creating Laurasia in the north and Gondwana in the south. Despite this separation, there were bridges between the two continents. Temperatures fell slightly, although it was still warmer than today. Rainfall increased as a result of the large seas appearing between the land masses. All these changes allowed plants such as ferns and horsetails to grow over wide areas. Elsewhere, there were forests of tall conifer trees such as sequoias and monkey puzzles. The plentiful plant supply allowed the huge plant eating sauropods – such as Apatosaurus, Diplodocus and Brachiosaurus – to evolve. These are the largest animals to have ever walked the Earth and their herds dominated the landscape by the end of the Jurassic.
Cretaceous Period (145–66 million years ago)
During the Cretaceous period, the land separated further into some of the continents we know, although they were in different positions. This meant that dinosaurs evolved independently in different parts of the world, so they became more distinct from one another. The first snakes evolved during this time, as well as the first flowering plants. A variety of insect groups appeared, including bees, which helped increase the spread of flowering plants. Mammals included tree climbers, ground dwellers and even predators of small dinosaurs. Then, 66 million years ago, came the mass extinction event – and the end of the Mesozoic Era.
From School Library Journal
About the Author
Dr. Matthew G Baron currently works at the Department of Earth Sciences, University of Cambridge. Matthew does research in Paleontology, Anatomy and Zoology. His current project is "Early Evolution of Dinosaurs".
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could have been an easy 5 rating instead of 4
Top international reviews
Bought for a cold who loves facts. Not all dinosaurs are listed and not all have pictures so bear in mind for the recipient.