Suppose the age of the earth is 24 hours.

If we compare the history of the earth from 4.5 to 4.6 billion years to 24 hours a day

1. Archaean-18-27 million years ago;

2. Proterozoic-① Early Proterozoic, 95-18 million years ago;

② Late Proterozoic (Great Wall, Jixian, Qingbaikou and Sinian), 6-95 million years ago.

3. Paleozoic —— ① Early Paleozoic (Cambrian, Ordovician and Silurian), 4-6 million years ago;

② Late Paleozoic (Devonian, Carboniferous and Permian), 225-4 million years ago;

4. Mesozoic-Triassic, Jurassic and Cretaceous, 7-225 million years ago;

5. Cenozoic-① Early Tertiary (Paleocene E1, Eocene E2, Oligocene E3), 25-7 million years ago;

② Late Tertiary (Miocene N1, Pliocene N2), 1-25 million years ago;

③ The Quaternary (early Pleistocene Q1, middle Pleistocene Q2 and late Pleistocene Q3) is 12, ~1 million years ago; Holocene Q4 is less than 12, years ago.

compress the 4.5 billion-year history of the earth into an ordinary day. Then, life started very early, and the first simple single-celled organisms appeared at about 4 o'clock in the morning, but little progress was made in the next 16 hours. It was not until about 8: 3 in the evening, when five-sixths of the day had passed, that the earth made some achievements in the universe, but it was just a layer of restless microorganisms. Then, the first batch of marine plants finally appeared. Twenty minutes later, the first jellyfish and the mysterious Eddie Jakala fauna that Reginald Sprigg first saw in Australia appeared. At 9: 4 p.m., trilobites appeared, followed by the beautiful animals in Burgess shale. It was nearly ten o'clock when plants began to appear on the earth. Before long, with less than two hours left in the day, the first land animals appeared. Due to the fine weather of about 1 minutes, by 1: 24, the earth was covered with great forests of Carboniferous period, and their residues became our coal. The first winged insects lit up. Just after eleven o'clock in the evening, dinosaurs walked slowly onto the stage and dominated the world for about three quarters of an hour. Twenty minutes before midnight, they disappeared and the era of mammals began. Humans appeared 1 minute and 17 seconds before midnight. According to this ratio, all our recorded history is only a few seconds long, and a person's life is only a moment.