Geology and Geography (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Geology and Geography

That this area was once beneath the sea is evidenced by the lime stone which underlies the region everywhere, and comes to the surface in several places. N ot only does the character of the rock itself indi cate that it was deposited in water, but it contains numerous fossils, all of which are the remains of animals that lived in the sea. We shall see that the region has been beneath the sea, not once only, but several times during its history.

Geologic time has been divided into eras, and the eras have been divided into periods. The events of these time intervals are recorded in the rocks. Those of successive eras are separated from one another by breaks in the record. For instance, over wide areas the group of rocks formed in the Proterozoic era were uplifted from the sea in which many of them were deposited, were folded, twisted, broken, and exposed for a long period to the action of the atmosphere and running water. All these events occurred before the beginning of the Paleozoic era. Then, at the beginning of Paleozoic time, the rocks were again sub merged and other sediments laid down upon them. These later sedi ments constitute the Paleozoic rocks. The interval between the upraising of the Proterzoic rocks and the deposition, of the Paleozoic rocks sepa rates the Proterozoic and Paleozoic eras. The periods are separated from one another by similar intervals during which conditions on the earth's surface changed, but the series of events between the successive periods were not as great as between the different eras.

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