TECH Signal 239
Erosion of an ancient Rodinia breakup escarpment explains the Grand Canyon's Great Unconformity
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Researchers propose that a massive cliff system formed during the breakup of the supercontinent Rodinia eroded up to eight kilometers of rock, explaining the Grand Canyon's missing billion-year rock record known as the Great Unconformity.
This finding provides a tectonic mechanism for the Great Unconformity, a gap in the geological record that influences where ancient sediments collected across North America. It links continental rifting and subsequent erosion to the exposure of crystalline basement rocks long before the Colorado River existed.
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A vast escarpment formed roughly 800 million years ago as the supercontinent Rodinia broke apart.
Erosion along this cliff system removed as much as eight kilometers of rock in some locations, exposing ancient basement rocks.
This process explains the Great Unconformity, a gap in the rock record spanning over a billion years across North America.
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