Synchronizing Rock Clocks of Earth History

RESEARCH ARTICLE in SCIENCE:
Synchronizing Rock Clocks of Earth History
K. F. Kuiper, A. Deino, F. J. Hilgen, W. Krijgsman, P. R. Renne, and J. R. Wijbrans (25 April 2008)
Science 320 (5875), 500. [DOI: 10.1126/science.1154339]

Also see commentary by Richard Kerr:
Science 25 April 2008:
Vol. 320. no. 5875, pp. 434 – 435
DOI: 10.1126/science.320.5875.434
NEWS OF THE WEEK
GEOCHEMISTRY:
Two Geologic Clocks Finally Keeping the Same Time
Richard A. Kerr

Additional commentary from Science Daily:
http://www.sciencedaily.com/releases/2008/04/080424140400.htm

and the Berkeley group:
http://www.berkeley.edu/news/media/releases/2008/04/24_argondating.shtml