| 1. | They lived during the Middle Cambrian period, about 505 million years ago.
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| 2. | Quartz Mountain is made of granite emplaced during the early Cambrian period.
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| 3. | This chart summarises Earth's history from the Cambrian period to the present.
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| 4. | "' Vladicarus subtilis "'is an extinct arthropod from the early Cambrian period.
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| 5. | During the Cambrian period, Wisconsin was covered by a warm shallow sea.
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| 6. | It contains rocks deposited before the Cambrian Period 540 million years ago.
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| 7. | The earliest such coralline algae, the solenopores, are known from the Cambrian period.
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| 8. | The Geological age of the Cambrian Period-is named after Fortune and Fortune Bay.
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| 9. | The evolutionary ancestry of arthropods dates back to the Cambrian period.
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| 10. | Then 545 million years ago, in the Cambrian Period, it burst wide open.
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