Geologists claim that there have been 5 major ice ages.
Starting Age
[million years ago]
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Geologic Period
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1,700 to 2,300 mya
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[TD="width: 76%"]the middle of the Huronian Era in Precambrian time
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670 mya
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[TD="width: 76%"]the end of the Proterozoic Era, in Precambrian time
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420 mya
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[TD="width: 76%"]the middle of the Paleozoic Era, between the Ordovician and Silurian Periods
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290 mya
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[TD="width: 76%"]the late Carboniferous and early Permian Periods, late in the Paleozoic Era
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1.7 mya
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[TD="width: 76%"]the Pleistocene Epoch of the Quaternary Period (Cenozoic Era)
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Just my opinion but I highly doubt they used ice to move to Americas, more likely it was rafts then boats...... How much food and water do they bring when your moving on a piece of ice?
Using rafts and boats it could have been done in stages from island to island and not necessarily from Northern Asia. The mummy they found in Nevada had traits of being from Japan and the items found with him are identical to items still produced in Japan.......
"Recent discoveries and examinations of mummified human remains seem to support theories that humans crossed from Asia to the Americas more than 11,000 years ago. Evidence from a mummy discovered in Western Nevada in 1940 indicate that the body is 9,400 years old. Technicians reconstructed a face for the skeleton and the features appear to be those of a remote Northern Japanese group and the clothing from the mummy matches the textiles still made by those Japanese. Current speculation is that humans could have crossed by boat to North America from a variety of places, i.e., Siberia, Japan, and China via the Bering Straits or by island hopping across the northern Pacific."
Either way it was a long and dangerous trip, and we think flying is dangerous.............LOL