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letters to nature 74 NATURE |VOL 410 |1 MARCH 2001 |www.nature.com

Summary: letters to nature
74 NATURE |VOL 410 |1 MARCH 2001 |www.nature.com
28. Shackleton, N. J., Berger, A. & Peltier, W. R. An alternative astronomical calibration of the lower
Pleistocene timescale based on ODP site 677. Trans. R. Soc. Edinb. Earth Sci. 81, 251±261 (1990).
29. Maasch, K. A. Statistical detection of the mid-Pleistocene transition. Clim. Dyn. 2, 133±143 (1988).
30. Chambers, J., Cleveland, W., Kleiner, B. & Tukey, P. Graphical Methods for Data Analysis 395
(Chapman & Hall/CRC, Boca Raton, 1983).
Supplementary information is available on Nature's World-Wide Web site
(http://www.nature.com) or as paper copy from the London editorial of®ce of Nature.
We thank the BDP Leg IV members from Russia, America and Japan who worked to drill
the BDP98 sediment cores, and J. Laskar, A. Berger and M.-F. Loutre for providing the
calculated results on insolation. We also thank colleagues in the hydro-geomorphological
laboratory at Kanazawa University and the geomagnetic laboratory of Toyama University
for their support in this research.
Correspondence and requests for materials should be addressed to K.K.
(e-mail: kashi@kenroku.kanazawa-u.ac.jp).


Source: Abercrombie, Rachel E. - Department of Earth Sciences, Boston University


Collections: Geosciences