. The dinosaur book : the ruling reptiles and their relatives. Dinosaurs; Reptiles, Fossil. If 3 inches= Age of Mnn (1 million years). y \ /50 inch = entire period of recorded history (5000 to present) accompanying figure, the reptiles appeared on the earth approximately 245 million years ago (Late Paleozoic era), and were even then dominant on the land. So the "Age of Reptiles" might be thought of as extending at least from the beginning of the Permian period (about 225 million years ago), at which time the primitive reptiles had become well-established upon the earth, to the e
. The dinosaur book : the ruling reptiles and their relatives. Dinosaurs; Reptiles, Fossil. If 3 inches= Age of Mnn (1 million years). y \ /50 inch = entire period of recorded history (5000 to present) accompanying figure, the reptiles appeared on the earth approximately 245 million years ago (Late Paleozoic era), and were even then dominant on the land. So the "Age of Reptiles" might be thought of as extending at least from the beginning of the Permian period (about 225 million years ago), at which time the primitive reptiles had become well-established upon the earth, to the end of the Mesozoic era, when reptilian dominance ceased with the disap- pearance of the last dinosaurs. Preceding this Age of Reptiles was an Age of Amphibians, including in a general way what the geologist refers to as Mis- sissippian and Pennsylvanian times. This was the period during which the first land vertebrates were evolving from their fish ancestors. It was the period during which the basic patterns for reptilian evolution began to be established. These, the Age of Amphibians and the Age of Reptiles are the periods of Earth History with which we shall be especially concerned in the following pages of this book. We are interested particularly in the dinosaurs, but in order to understand them properly it will be necessary to give some attention to their predecessors and their contemporaries. So it is that our story be- gins with the emergence of the vertebrates from their watery ancestral home. 39. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Colbert, Edwin H. (Edwin Harris), 1905-2001; Knight, Charles Robert, 1874-1953; American Museum of Natural History. New York : Published for the American Museum of Natural History by McGraw-Hill
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Keywords: ., bookauthoramericanmu, bookcentury1900, booksubjectreptilesfossil
