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John P. Rafferty, "The Mesozoic Era: Age of Dinosaurs"

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the Brontosaurs, an out-of-date term, but one which many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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