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• Shorter times
• 340 million years -- time since beginning of Carboniferous Period
• 340 million years -- time since end of Devonian Period
• 400 million years -- time since beginning of Devonian Period
• 400 million years -- time since end of Silurian Period
• 420 million years -- time since first creature took a breath of air
• 435 million years -- time since beginning of Silurian Period
• 435 million years -- time since end of Ordovician Period
• 500 million years -- time since beginning of Ordovician Period
• 500 million years -- time since end of Cambrian Period
• 540 million years -- time since beginning of Cambrian Period
• 540 million years -- time since end of Precambrian
• 580 million years -- time since end of possible Snowball Earth ice age
• 600 million years -- age of first complex multicelled lifeforms
• 703.8 million years -- half-life of uranium-235
• 750 million years -- time since beginning of possible Snowball Earth ice age
• 1277 million years -- half-life of potassium-40
• 2300 million years -- time since first known ice age
• Longer times