Originated or started at time.

Originated or existed from historically.

Determining age using carbon isotopes.

Expires soon, reduced shelf life.

Maturity far in the future.

Start date for accruing interest.

Refers to two sets of dates.

The oldest dated rocks formed on Earth, as an aggregate of minerals that have not been subsequently broken down by erosion or melted, are more than 4 billion years old, formed during the Hadean Eon of Earth's geological history, and mark the start of the Archean Eon, which is defined to start with the formation of the oldest intact rocks on Earth.