| 21. | Its bedrock is Precambrian-era gray and black shale.
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| 22. | For that explains why we find no Precambrian proto-arthropod fossils.
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| 23. | The formation is predominantly Precambrian granite with outcroppings of quartz and schorl.
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| 24. | Mineralization occurs within the Laramide intrusive and in the surrounding Precambrian porphyry.
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| 25. | A thought just occurred to me on the subject of Precambrian rabbits.
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| 26. | The unit is of Cambrian age and rests unconformably on Precambrian rock.
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| 27. | It was deposited in a nearshore environment, unconformably overlying Precambrian basement.
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| 28. | The Precambrian Era dates from around 3850 to 542 million years ago.
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| 29. | They overlie Precambrian conglomerates and are overlain by the Calcaires de Laize.
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| 30. | Many of Canada's major ore deposits are associated with Precambrian volcanoes.
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