# The Grand Canyon is missing over a billion years of rocks. Now scientists know why.

Source: [Latest from Live Science in Planet-earth](https://www.livescience.com/planet-earth/geology/the-grand-canyon-is-missing-over-a-billion-years-of-rocks-now-scientists-know-why) · 2026-11-11 · Earth & Climate
Page: https://themorning.science/story/the-grand-canyon-is-missing-over-a-billion-years-of-rocks-now-scientists-know-wh-42e8b22a018f1651
Kind: research · Impact: low

## In brief

- More than a billion years of geological history is missing from the walls of the Grand Canyon.
- Ancient metamorphic and igneous rocks, formed about 1.7 billion years ago, sit directly beneath younger sedimentary rocks.
- Scientists may now know why the rock record is missing, according to Live Science.

## Why it matters

The missing layers form a gap in the rock record, so understanding their cause helps geologists interpret how long-term erosion and deposition shaped the canyon.

## Timeline

- 2026-11-11: Live Science reports that scientists may have found why more than a billion years of rock is missing from the Grand Canyon

## Coverage

- [The Grand Canyon is missing over a billion years of rocks. Now scientists know why.](https://www.livescience.com/planet-earth/geology/the-grand-canyon-is-missing-over-a-billion-years-of-rocks-now-scientists-know-why) — Latest from Live Science in Planet-earth, 2026-11-11

Tags: geology, grand canyon, unconformity, sedimentary rocks, earth history

---

Brief generated by AI (claude-haiku-5-5) from the reporting listed under Coverage. Headlines belong to their publishers. The Morning Science – https://themorning.science