-4500 —
–
-4250 —
–
-4000 —
–
-3750 —
–
-3500 —
–
-3250 —
–
-3000 —
–
-2750 —
–
-2500 —
–
-2250 —
–
-2000 —
–
-1750 —
–
-1500 —
–
-1250 —
–
-1000 —
–
-750 —
–
-500 —
–
-250 —
–
0 —
（百萬年）
*冰河時期
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