U–Pb zircon age of an Ordovician tuff in southeast Yukon: implications for the age of the Cambrian–Ordovician boundary

Author： Crowley J.L. Pyle L.J. Abbott J.G. Roots C.F. Schmitz M.D.

ISSN： 1480-3313

Source： Canadian Journal of Earth Sciences, Vol.49, Iss.6, 2012-06, pp. : 732-741

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