New data from Hadar (Ethiopia) support orbitally tuned time scale to 3.3 MA

Details New data from Hadar (Ethiopia) support orbitally tuned time scale to 3.3 MA New data from Hadar (Ethiopia) support orbitally tuned time scale to 3.3 MA

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1067r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 11, p. 1067-1070.

Astronomy and Astrophysics

Astronomy

13

Climate Change, Geochronology, Orbital Elements, Radioactive Age Determination, Solar Orbits, Stratigraphy, Calibrating, Ethiopia, Paleomagnetism, Time Series Analysis

Scientific paper

Support for the astronomically calibrated geomagnetic polarity time scale is provided by new Ar-40/Ar-39 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.

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