Ch 12 Proterozoic Eon
Proterozoic Eon
Proterozoic Eon
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Early <strong>Proterozoic</strong> life<br />
Single-celled, eukaryotic<br />
algae–acritarchs–became<br />
abundant after ~1.9Ga<br />
Acritarchs are relatively<br />
large and possess a complex<br />
cell wall. Probably related<br />
to modern planktonic algae<br />
(dinoflagellates)<br />
35µm<br />
Earth History, <strong>Ch</strong>. <strong>12</strong> <strong>12</strong>
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