Ch 12 Proterozoic Eon
Proterozoic Eon
Proterozoic Eon
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Early <strong>Proterozoic</strong> Life<br />
• Stromatolites<br />
continued to increase<br />
in abundance,<br />
especially after 2.2<br />
Ga, probably because<br />
of the establishment<br />
of broad continental<br />
shelves<br />
Earth History, <strong>Ch</strong>. <strong>12</strong> 2
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