Topic: Earth Science
Scientists found evidence of a giant ancient cliff system that may have exposed deep rocks in the Grand Canyon nearly a billion years ago. The study, led by researchers at the University of Southampton, suggests this massive escarpment formed about 800 million years ago as the supercontinent Rodinia broke apart.
A team of scientists has discovered evidence that an enormous ancient cliff system may have helped expose the deepest rocks of the Grand Canyon nearly a billion years before the Colorado River began carving the landscape seen today. The study, led by researchers at the University of Southampton in the UK, suggests that a vast 'great escarpment' formed about 800 million years ago as the supercontinent Rodinia broke apart.
These towering cliffs may have reached roughly a kilometer in height and extended for thousands of kilometers along western North America. Over time, erosion along this immense rocky boundary removed huge amounts of material, eventually exposing ancient crystalline basement rocks that can now be seen in the Grand Canyon in southern Arizona.
The researchers propose that this ancient escarpment crossed areas that today include Arizona, Utah, Idaho, Wyoming, Colorado, Texas, Oklahoma, Arkansas, Missouri, and Illinois. The study suggests that powerful erosion across this enormous region eventually uncovered some of the oldest rocks in North America, with the Grand Canyon providing the best known example.
To investigate what the region may have looked like hundreds of millions of years ago, the team combined reconstructions of plate tectonic movements with data showing how landscapes evolve through time. Their results indicate that when Rodinia was fragmenting, the future Grand Canyon sat in roughly the same position relative to the continental edge as major escarpments found today in places such as South Africa and Brazil.
Why It Matters
Understanding this lost mega-cliff can help us better comprehend how our planet's landscape has changed over millions of years. This knowledge can also inform our efforts to mitigate the effects of climate change, which is causing rapid changes to our environment.
Key Facts
- A team of scientists from the University of Southampton and other institutions found evidence of a giant ancient cliff system that may have exposed deep rocks in the Grand Canyon nearly a billion years ago.
- The study suggests that this massive escarpment formed about 800 million years ago as the supercontinent Rodinia broke apart.
- These towering cliffs may have reached roughly a kilometer in height and extended for thousands of kilometers along western North America.
- The researchers propose that this ancient escarpment crossed areas that today include Arizona, Utah, Idaho, Wyoming, Colorado, Texas, Oklahoma, Arkansas, Missouri, and Illinois.
- The study suggests that powerful erosion across this enormous region eventually uncovered some of the oldest rocks in North America, with the Grand Canyon providing the best known example.
Key Terms
- Escarpment
- A steep slope or cliff formed by tectonic activity
- Rodinia
- An ancient supercontinent that existed about 1.1 billion years ago
- Great Unconformity
- A mysterious gap in the rock record that spans over a billion years
Implications
Understanding this lost mega-cliff can help us better comprehend how our planet's landscape has changed over millions of years. This knowledge can also inform our efforts to mitigate the effects of climate change, which is causing rapid changes to our environment.
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