Sentences with phrase «wide glaciations»

Geologists knew of some fairly widespread glaciations in the past: there was an ice - age at the end of the Ordovician period, some 445 million years back and, going further back again, there were some huge, perhaps planet - wide glaciations in the Proterozoic eon.
Geologists knew of some fairly widespread glaciations in the past: there was an ice - age at the end of the Ordovician period, some 445 million years back and, going further back again, there were some huge, perhaps planet - wide glaciations in the Proterozoic eon.
Surprisingly, the scientists said, this appeared to coincide with wide glaciation, an analysis, wrote Crayton J. Yapp and Harald Poths in the journal Nature, that «suggests that the climate models require modification.»
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