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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

Volume: 66 (1982)

Issue: 4. (April)

First Page: 471

Last Page: 476

Title: Age of Eocene/Oligocene Boundary Based on Extrapolation from North American Microtektite Layer

Author(s): B. P. Glass, Jill R. Crosbie (2)

Abstract:

Microtektites believed to belong to the North American tektite strewn field have been found in upper Eocene sediments in cores from nine Deep Sea Drilling Project sites in the Caribbean Sea, Gulf of Mexico, equatorial Pacific, and eastern equatorial Indian Ocean. The microtektite layer has an age of 34.2 ± 0.6 m.y. based on fission-track dating of the microtektites and K-Ar and fission-track dating of the North American tektites. Extrapolation from the microtektite layer to the overlying Eocene/Oligocene boundary indicates an age of 32.3 ± 0.9 m.y. for the Eocene/Oligocene boundary as defined at each site in the Initial Reports of the Deep Sea Drilling Project. This age is approximately 5 m.y. younger than the age of 37.5 m.y. that is generally assigned to the b undary based on recently published Cenozoic time scales.

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