Myr

In writing about prehistory, years are often grouped together in units of one million. Million years ago or megaannum may be abbreviated as mya, myr or Ma.^[1]

References

↑ Alden, Andrew (2019-08-17). "How to Abbreviate Millions of Years Old". Retrieved 2022-08-28.

This short article about history can be made longer. You can help Wikipedia by adding to it.

[thoughtco-1] Alden, Andrew (2019-08-17). "How to Abbreviate Millions of Years Old". Retrieved 2022-08-28.

[1]