The Mesozoic Era: Age of Dinosaurs (Geologic History of Earth) - ISBN:1615301038

The Mesozoic Era: Age of Dinosaurs (Geologic History of Earth)

Date: 22 May 2011, 14:26

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It was a time of huge “thunder lizards” roaming steamy
fern jungles; of “mammal-reptiles” walking the land of
Laurasia; of continental movements, mountain building,
and massive volcanoes; and a time of the most horrific,
earth-shattering extinctions that ever occurred on this
planet. It was the middle times of what is called the
Phanerozoic Eon, a geologic interval lasting almost a half
billion years. It was the time of the dinosaurs…and much,
much more. We call this time the Mesozoic Era.
Dinosaurs. The word itself immediately calls to mind
large, predatory reptiles stalking the Earth. As young and
old alike experience such visual, visceral responses to the
word, it is difficult to believe that a mere 200 years ago, no
one had any idea that these creatures had ever existed.
This book takes readers back to that point of discovery
and classification, when English anatomist Sir Richard
Owen first attempted to classify strange bones found in his
country. And discoveries continue. Readers will learn about
new and contradictory ideas of what the dinosaurs were—
and were not. Were they cold-blooded? Did they all vanish
in an extinction? The answers might surprise you.
Dinosaurs were the dominant life form of the Mesozoic
Era. Each period within that era had a different variety of
these amazing creatures, but all can generally be assigned
to one of two major groups: Saurischia (“lizard hips”) or
Ornithischia (“bird hips”). Those in the Saurischia group
belong to either the Sauropodomorpha subgroup, which
consist of herbivores, or the Theropoda subgroup, the
carnivores. Examples of the first subgroup would include
the Brontosaurs, an out-of-date term, but one which many
people can identify as the massive long-necked leaf-eater
of cartoons. These animals could reach 30 metres (100
feet) in length and weigh in excess of 70 metric tons.
Probably the most recognizable theropod would be the
mighty Tyrannosaurus rex, 15 metres (50 feet) and 5 metric

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