SNOWBAL L EARTH : TH E STOR Y O F TH E GREA T GLOBA L CATASTROPH E THA T SPAWNE D LIF E A S W E KNO W IT Gabrielle Walker, 2003, 269 pp., $24.95, hardbound, Crown Publishing Group, ISBN 0-609-60973-4 ive years ago, Paul Hoffman and colleagues at interbedded with igneous rocks in which the remnant magnetization is parallel to the original bedding plane F o f the rocks, indicating a low-latitude origin. The Harvard University published a paper in Science Australian geologist George Williams and his col- (Hoffman et al. 1998) in which they argued that leagues had realized this decades ago, but they focused the Earth experienced global glaciation at least twice on Williams's alternative, "high-obliquity hypothesis" during the Neoproterozoic Era, once at 750 million (Williams 1975), which has received little support in years ago and again at 600 million years ago. This recent years. During the late 1980s, Joe Kirschvink "snowball Earth" hypothesis, which had been sug- performed a definitive "fold test" on some o f the Aus- gested by Joe Kirschvink at Caltech several years ear- tralian rock samples. He found that the em- lier (Kirschvink 1992), has caught the attention of
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Nov 1, 2003
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