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Dacite: extrusive igneous rock
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Dacite: extrusive igneous rock. Precambrian. McBrien Lake Dacite, Somerset Street, Saint John Collector: R. Miller, 2011. Specimen width 19 cm. Rocks like the lava (Dacite) of the McBrien Lake Formation (554 ±14 million years old) and the Fairville Granite (548 ± 2 million years old) are pieces of the plate tectonics puzzle.
