Preboreal
The Preboreal is a stage of the Holocene epoch. It is preceded by the Tarantian and succeeded by the Boreal. It lasted from 10,300 to 9,000 BP in radiocarbon years or 10,000 BC to 8250 BC in Gregorian calendar years. It is the first stage of the Holocene epoch.
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| | Early (485.4–470.0 Mya) | |
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| Middle (470.0–458.4 Mya) | |
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| Late (458.4–443.4 Mya) | |
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| | Llandovery (443.4–433.4 Mya) |
- Rhuddanian (443.4–440.8 Mya)
- Aeronian (440.8–438.5 Mya)
- Telychian (438.5–433.4 Mya)
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- Sheinwoodian (433.4–430.5 Mya)
- Homerian (430.5–427.4 Mya)
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| Ludlow (427.4–423.0 Mya) |
- Gorstian (427.4–425.6 Mya)
- Ludfordian (425.6–423.0 Mya)
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| Pridoli (423.0–419.2 Mya) | |
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| | Early (419.2–393.3 Mya) |
- Lochkovian (419.2–410.8 Mya)
- Pragian (410.8–407.6 Mya)
- Emsian (407.6–393.3 Mya)
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| Middle (393.3–382.7 Mya) | |
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| Late (382.7–358.9 Mya) | |
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| | Cisuralian (298.9–272.3 Mya) | |
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| Guadalupian (272.3–259.8 Mya) | |
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| Lopingian (259.8–252.17 Mya) | |
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| | | | | | kya = thousands years ago. Mya = millions years ago. * Not officially recognized by the I.C.S. |
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