Types
Intermediate volcanic rock
Algoma-type , Lake Superior-type and Superior-type
Features
Has High structural resistance against erosion and climate, Host rock for Diamond, Very fine grained rock
Is one of the oldest rock
Archaeological Significance
Monuments
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Famous Monuments
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Sculpture
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Famous Sculptures
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Pictographs
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Petroglyphs
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Figurines
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Fossils
Absent
Present