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440 million years ago
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the Cambrian period is the first geological period of the Paleozoic Era
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The oldest of all geologic stages 3.5 billion years age -540 million years ago
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505 million years ago - 438 million years ago
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The silorian period 438 mya - 408 mya
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Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.