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Ch. 1: Precious Stones Introduction

Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction Text size:minus plus Restore normal size   Mail page  Print this page
10
PRECIOUS STONES.
have furnished names for remote eras,—for all the geological ages, indeed, included between the azoic age and the age of man.
With the high temperature of the igneous forma­tions, life was incompatible; consequently no fossil
ever appears, or possibly could appear, in rocks of this kind. In sedimentary formations, on the con­trary, such remains abound, and furnish another excellent means of distinguishing them from the igneous rocks.
A few illustrations will exemplify types of animal and vegetable fossils incident to different periods.
Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction
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