Orosirian facts for kids
The Orosirian is the third geological period in the Palaeoproterozoic. It began 2.05 billion years ago (bya) and ended at 1.8 bya.
The latter half of the period was a time of mountain-building on nearly all continents. It was the time when the supercontinent Columbia began to form.
Two of the largest known impact events on Earth happened during the Orosirian. At the beginning of the period, 2023 million years ago (mya), a large asteroid hit the earth and created the Vredefort impact structure. The event that created the Sudbury Basin structure happened near the end of the period about 1850 mya.
| Precambrian (4.567 gya – 541 mya) | |
|---|---|
| In the left column are Eons, bold are Eras, not bold are Periods. gya = billion years ago, mya = million years ago | |
| Hadean (4.567 gya – 4 gya) | Chaotian Zirconian |
| Archaean (4 gya – 2.5 gya) | Eoarchaean (4 gya – 3.6 gya)
Palaeoarchaean (3.6 gya – 3.2 gya) |
| Proterozoic (2.5 gya – 541 mya) | Palaeoproterozoic (2.5 gya – 1.6 gya) Siderian (2.5 gya – 2.3 gya) Rhyacian (2.3 gya – 2.05 gya) Orosirian (2.05 gya – 1.8 gya) Statherian (1.8 gya – 1.6 gya)
Mesoproterozoic (1.6 gya – 1 gya) Calymmian (1.6 gya – 1.4 gya) Ectasian (1.4 gya – 1.2 gya) Stenian (1.2 gya – 1 gya) Neoproterozoic (1 gya - 541 mya) Tonian (1 gya – 720 mya) Cryogenian (720 mya – 635 mya) Ediacaran (635 mya – 541 mya) |
See also
In Spanish: Período Orosírico para niños
