Ice spread till Equator
Washington: Geologists have found evidence that sea ice extended to the Equator 716.5 million years ago, which gives weight to the theory of a "snowball Earth" event long suspected to have taken place around that time.
The research was funded by the National Science Foundation and led by scientists at Harvard University. The new findings, based on an analysis of ancient tropical rocks that are now found in remote northwestern Canada, bolster the theory Earth has, at times in the past, been ice-covered at all latitudes.
"This is the first time that the Sturtian glaciation has been shown to have occurred at tropical latitudes, providing direct evidence that this particular glaciation was a ‘snowball Earth’ event," said lead author Francis Macdonald.
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