Earth's rocks have a missing layer spanning up to a billion years. Scientists finally know what happened to it
Scientific American ·
The 'Great Unconformity' has puzzled scientists since its discovery in the 1870s
Earth's rocks have a missing layer spanning up to a billion years. Scientists finally know what happened to it
The 'Great Unconformity' has puzzled scientists since its discovery in the 1870s
1 sources · 1 articles · updated 2026-11-07 13:00 UTC · science