1 E16 S

• 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

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707 701 724 737 718 872 1028 1019 570 571 572	379 1 e 13 m 1 e 11 m 1 e 9 m 1 e26 m 1320 1350s 1 e 43 s 1 e12 s 1 e11 s 1 e 9 s	1 e 44 s 1 e13 s 1 e14 s 1 e15 s 1 e17 s 1 e 13 j 1534 1536 1323 1346 1348	1360s 1364 1365 1388 1394 1415 1431 1437 1457 1458 1 e2 kg