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Bruce Series
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Bruce Series

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Also known as: Lower Huronian
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Related Topics:
Huronian System
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Bruce Series, division of Precambrian rocks in North America that is well-developed northeast of the Lake Huron region (the Precambrian began about 3.8 billion years ago and ended 540 million years ago). The Bruce Series is the lowermost of the three major divisions of the Huronian System; it overlies pre-Huronian schists, underlies rocks of the Cobalt Series, and consists of about 1,500 m (about 5,000 feet) of quartzites, conglomerates, limestones, and siltstones. The conglomerate that begins the Bruce is separated from pre-Huronian schists by a profound erosional surface representing a time span of unknown duration. The Bruce sediments were probably ...(100 of 231 words)

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