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Renne et al. 1993

Renne, P., Walter, R., Verosub, K., Sweitzer, M. and Aronson, J. (1993). New data from Hadar (Ethiopia) support orbitally tuned time scale to 3.3 MA. Geophysical Research Letters 20: doi: 10.1029/93GL00733. issn: 0094-8276.

Support for the astronomically calibrated geomagnetic polarity time scale is provided by new 40Ar/39Ar dating and magnetostratigraphic data from the Hadar Formation, Ethiopia. Three tuffs and a basalt flow at Hadar span the Mammoth subchron of the Gauss chron, and range in age from 3.18¿0.01 to 3.40¿0.03 Ma. Interpolation of sediment accumulation rates in two magnetostratigraphic sections yields an estimated age range of 3.30¿0.02 to 3.21¿0.01 Ma for the Mammoth subchron, closely coinciding with orbitally based predictions of 3.33 to 3.22 Ma rather than with previous estimates of 3.15 to 3.05 Ma. ¿ American Geophysical Union 1993

BACKGROUND DATA FILES

	Abstract

Keywords
Geomagnetism and Paleomagnetism, Reversals (process, time scale, magnetostratigraphy), Mineralogy, Petrology, and Rock Chemistry, Geochronology (radiometric), Information Related to Geographic Region, Africa

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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