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Science 25 July 2008:
Vol. 321. no. 5888, p. 490
DOI: 10.1126/science.1157501
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Technical Comments

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

J. M. Whittaker,1* R. D. Müller,1 G. Leitchenkov,2 H. Stagg,3 M. Sdrolias,1 C. Gaina,4 A. Goncharov3

Accurately locating boundaries between continental and oceanic crust is topical in view of locating offshore boundaries relevant to margin formation models, plate kinematics, and frontier resource exploration. Although we disagree with Tikku and Direen's interpretations, the associated controversies reflect an absence of agreed-upon geophysical criteria for distinguishing stretched continental from oceanic crust, and a lack of samples from nonvolcanic margins.

1 EarthByte Group, School of Geosciences, University of Sydney, Sydney 2006, Australia.
2 VNII Okeangeologia (Antarctic Branch), St. Petersburg 190121, Russia.
3 Geoscience Australia, Canberra 2601, Australia.
4 Center for Geodynamics, Norwegian Geological Survey, Trondheim 7491, Norway.

* To whom correspondence should be addressed: E-mail: j.whittaker{at}geosci.usyd.edu.au

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