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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
GEOLOGICAL POSITION.
1.3
formation, in which are found such shells as those represented by Figs. 11, 12, and 13. By this time creatures had begun to appear bearing a strong
resemblance to those of the present period. Figs. 14 and 15 illustrate characteristic types.
After the tertiary formation comes the post-ter­tiary or quarternary formation, in which the animals are quite analogous to those of our own period.
If we inquire of chemistry what is the composi-
Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction
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