title: 40Ar/39Ar Age of Cretaceous-Tertiary Boundary Tektites from Haiti.
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.
authors.forename: G A
authors.initials: GA
authors.lastname: Izett
authors.forename: G B
authors.initials: GB
authors.lastname: Dalrymple
authors.forename: L W
authors.initials: LW
authors.lastname: Snee