Ch 12 Proterozoic Eon
Proterozoic Eon
Proterozoic Eon
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Neoproterozoic life<br />
• Trace fossils<br />
– Burrows, tracks, trails<br />
– Not known in rocks<br />
older than ~570 Ma*<br />
– Their presence is good<br />
evidence for animal<br />
activity<br />
*hold that thought<br />
Late <strong>Proterozoic</strong> feeding<br />
burrows from Norway<br />
Earth History, <strong>Ch</strong>. <strong>12</strong> 16
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