Author:
Baadsgaard H.,Lerbekmo J. F.
Abstract
A Rb/Sr isochron age of 63.6 ± 0.4 Ma for bentonite biotite and sanidine at Hell Creek, Montana, dates a palynofloral change marking the Cretaceous–Tertiary boundary in west-central North America. Extensive Rb and Sr variations caused by alteration of the biotites does not seem to unduly affect the presumed crystallization age of the biotite.
Publisher
Canadian Science Publishing
Subject
General Earth and Planetary Sciences
Cited by
16 articles.
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