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  • Title: 40Ar/39Ar Age of Cretaceous-Tertiary Boundary Tektites from Haiti.
    Author: Izett GA, Dalrymple GB, Snee LW.
    Journal: Science; 1991 Jun 14; 252(5012):1539-42. PubMed ID: 17834880.
    Abstract:
    (40)Ar/(39)Ar dating of tektites discovered recently in Cretaceous-Tertiary (K-T) boundary marine sedimentary rocks on Haiti indicates that the K-T boundary and impact event are coeval at 64.5 +/- 0.1 million years ago. Sanidine from a bentonite that lies directly above the K-T boundary in continental, coal-bearing, sedimentary rocks of Montana was also dated and has a (40)Ar/(39)Ar age of 64.6 +/- 0.2 million years ago, which is indistinguishable statistically from the age of the tektites.
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