Everything about Bya totally explained
In
astronomy,
geology, and
paleontology,
bya or "
b.y.a." is an
acronym for
billion years ago. This abbreviation is commonly used as a
unit of
time to denote length of time before the
present. Specifically, one bya is equal to 10
9 years ago.
The "billion" in bya is, by convention, the short-scale
billion (10
9) of American preference, not the long-scale billion (10
12) of British usage. For this reason, there's some potential for confusion; and some scientists prefer the unit
Gya, while others prefer
Ga (Giga annum). However, bya remains in more widespread use.
It should be noted that like the related unit
mya ("million years ago"), bya is traditionally written in
lowercase. This is different from
Ga or Gya, which
capitalizes the first letter.
Events around 1 to 13 bya:
Hadean 4.567 to 3.80 bya
Archean 3.8 to 2.25 bya
Proterozoic 2.25 to 0.5 bya
Supercontinents:
Further Information
Get more info on 'Bya'.
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