A Textbook of Geology volume 2

Cover A Textbook of Geology volume 2
A Textbook of Geology volume 2
Grabau, Amadeus W. (Amadeus William), 1870-1946
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1422. A Carbonic insect of the order Protorthoptera (Propteticus in- fernus, X^-). Coal-measures of Illinois.
time, and myriapods (thousand-legs and centipedes), often of large size, were common. Some of these types are illustrated in the figures in Chapter XL.
But the most striking of the land forms were the amphibians of the group Stegoccpkalia, which had their heads covered with bony plates and their tooth- structure much complicated (Labyrinthodont type). These became more characteristic in
... the succeeding period, when reptiles also became a striking element of the land fauna. Their structure, rise and decline will be more fully discussed in another chapter (Chapter XL).
Plants Because of the wide extent of continental strata, especially those inclosing coal beds, the flora of the Carbonic or Pennsylvanian is preserved in extenso, and often in wonderful perfection. Many of the plants found in these beds had their ancestry in the preceding era, or even in the Devonian, but at no 5 02 The Pennsylvanian System previous time was the plant life ofthe land undergoing such great modification nor did it exist in such profusion as in the Carbonic or Pennsylvanian era.


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