American Geology, Vol. 2: Containing a Statement of the Principles of the Science, With Full Inspirations of the Characteristics American Fossils: ... Map of the United States (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from American Geology, Vol. 2: Containing a Statement of the Principles of the Science, With Full Inspirations of the Characteristics American Fossils: Also an Atlas and a Geological Map of the United States

Perturbations of the earth's crust are cotemporaneous with the changes in the organic world; they seem to mark the outgoing and incoming of the geologic periods. The systems are par ticularly indicated by physical changes. Hence the outgoing of organic forms are connected together as cause and effect with the perturbations of the earth's crust. We are not, how ever, to carry this doctrine too far; facts seem to show that many species survive a perturbation, and in historic times spe cies have become extinct from causes which can not be traced to perturbations of the earth's crust.

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