Oldest preserved rocks (Acasta Gneiss)
Rocas más antiguas conservadas (gneis de Acasta)
- Date
- c. 4030 Ma · confidence medium
- Place
- Acasta River, Northwest Territories, Canada
- Credited to
- Natural event
- Field
- Cosmos & Earth
What was discovered
The Acasta gneisses in the Canadian Shield are the oldest known intact rocks: a fragment of crust from the end of the Hadean eon.
Planetary event (F5), verified against sources on 25-09-2026.
What it led to
- Study of the early crust