Biology | Which Biological Events Occurred During The Geologic Time Divisions?
Which biological events occurred during the geologic time divisions?
As the following table shows, humans have been on Earth a relatively short period of time compared to other animals. Marine invertebrates (animals with no backbone) were present at the end of the Precambrian Era (about 3,800 million years ago). Humans, however, have been present on the Earth only since the Cenozoic Era (approximately 10,000 years ago).
| Period | Epoch | Beginning date in est. millions of years | Plants and microorganisms | Animals |
| Quaternary | Holocene (Recent) | 10,000 years ago | Decline of woody plants and rise of herbaceous plants. | Age of Homo sapiens; humans dominate. |
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