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Science 25 July 2008:
Vol. 321. no. 5888, p. 490
DOI: 10.1126/science.1157163
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Technical Comments

Comment on "Major Australian-Antarctic Plate Reorganization at Hawaiian-Emperor Bend Time"

Anahita A. Tikku1,2* and Nicholas G. Direen3,4

Whittaker et al. (Reports, 5 October 2007, p. 83) presented reconstructions for Australia and Antarctica showing a change in relative plate motion ~53 million years ago, coincident with an inferred major global plate reorganization. This comment addresses problematic areas in their assumptions and the geological consequences of their reconstructions.

1 ExxonMobil Upstream Research Company, Post Office Box 2189, Houston, TX 77252–2189, USA.
2 Rensselaer Polytechnic Institute, Department of Earth and Environmental Sciences, 110 8th Street, Troy, NY 12180, USA.
3 University of Tasmania, School of Earth Sciences, Private Bag 79, Hobart, TAS 7001, Australia.
4 FrOG Tech Pty. Ltd., Post Office Box 145, Blackmans Bay, TAS 7052, Australia.

* To whom correspondence should be addressed. E-mail: anahita.a.tikku{at}exxonmobil.com

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Science. ISSN 0036-8075 (print), 1095-9203 (online)