Official timeline for NCField

Proterozoic

542,000,000 BC
542,000,000 BC

Paleozoic

542,000,000 BC - 251,000,000 BC
542,000,000 BC - 488,000,000 BC
488,000,000 BC - 444,000,000 BC
444,000,000 BC - 416,000,000 BC
416,000,000 BC - 359,000,000 BC
359,000,000 BC - 318,000,000 BC
318,000,000 BC - 299,000,000 BC
299,000,000 BC - 251,000,000 BC
251,000,000 BC
65,500,000 BC

Meszoic

251,000,000 BC - 65,500,000 BC
250,000,000 BC - 200,000,000 BC
200,000,000 BC - 145,000,000 BC
145,000,000 BC - 65,500,000 BC

Cenozoic

65,500,000 BC - 33,900,000 BC
65,500,000 BC - 2013