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How old are zircons from a pretrilobite Cambrian ash bed in New Brunswick?
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Cambrian Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the late Cambrian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
Zircons from a lower Lower Cambrian (pretrilobite) volcanic ash bed in New Brunswick, Canada, have been dated to 531 million years old using the uranium-lead dating method.1