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Ch. 1: Precious Stones Introduction

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GEOLOGICAL POSITION.                     11
Figs. 4, 5, and 6 represent animal and vegetable forms that existed in a period incalculably remote,
and are found in rocks belonging to what has been called the primary or palaeozoic period.
Those represented by Figs. 7, 8, 9, and 10 ap­pertain to the secondary formations, such as the
Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction
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