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    "headline": "Grand Canyon’s missing billion years may trace to a lost mega-cliff; up to 8 km of rock was stripped awa",
    "description": "A Southampton-led study says a lost mega-cliff from Rodinia's breakup stripped up to 8 km of rock, shaping the Grand Canyon's Great Unconformity.",
    "datePublished": "2026-11-14T20:00:00+00:00",
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    "keywords": "Grand Canyon, Great Unconformity, Rodinia, University of Southampton",
    "articleBody": "Up to 8 kilometers of rock, roughly five miles stacked straight up, may have been scraped off the land that became the Grand Canyon by a giant retreating cliff, long before the Colorado River cut a single bend. That is the proposal from a team led by the University of Southampton in England, and it offers a fresh answer to one of geology’s oldest puzzles: the Great Unconformity, where more than a billion years of rock record simply is not there. The study, published in the journal Geology, argues that a “great escarpment” of steep cliffs, around a kilometer high, formed as the supercontinent Rodinia split apart about 800 million years ago. As that cliff line crept inland over tens of millions of years, it chewed away rock and laid bare the ancient crystalline basement that hikers now see at the bottom of the canyon. What is the Great Unconformity? An unconformity is a seam in the rock where time goes missing: younger layers sit directly on far older ones, and everything that should lie between has been worn away. The explorer John Wesley Powell described the Grand Canyon example in 1869. The gap is not the same everywhere. According to the reference summary of the Great Unconformity, it spans about 175 million years where the Tonto Group rests on the youngest Grand Canyon Supergroup rocks, about 725 million years at the base of that supergroup, and as much as 1.2 to 1.6 billion years where the Tonto Group sits on the Vishnu Basement Rocks. At Frenchman Mountain in Nevada, 550-million-year-old Tapeats Sandstone lies on 1.7-billion-year-old Vishnu rock, a jump of about 1.2 billion years in a single step. How the team built its case The researchers paired plate tectonic reconstructions with models of how landscapes evolve to replay western North America as Rodinia came apart. In that reconstruction, the Grand Canyon region sat in the same position relative to the old continental edge as today’s great escarpments in South Africa and Brazil. The ancient cliff line would have crossed land that is now 10 US states: Illinois, Missouri, Arkansas, Oklahoma, Texas, Colorado, Wyoming, Idaho, Utah and Arizona. The predicted loss of up to 8 kilometers fits separate evidence that the region lost some 5 to 10 kilometers of rock before the modern canyon existed. “Our paper suggests the Canyon’s basement rocks were progressively brought to the surface as part of an immense escarpment that developed during the breakup of an ancient supercontinent,” said lead author Thomas Gernon, professor of Earth science at Southampton, in the university’s announcement. The team included researchers from the GFZ Helmholtz Centre for Geosciences and the University of Potsdam in Germany and the University of Illinois Urbana-Champaign. Why it matters The idea links the missing rock to something we can still watch today. Escarpments in Africa, Brazil, India and Antarctica are slowly retreating now, so geologists have living examples to measure. Gernon said the mountainous rim around ancient North America may also have steered rivers, controlled where sediment piled up and shaped when seas flooded the continent before the Cambrian explosion of complex life. Limits This is a model-based reconstruction, not a direct measurement of a vanished cliff, and no single explanation for the Great Unconformity has won broad acceptance. A long-running rival idea blames glaciers of the Snowball Earth era, starting about 720 million years ago; another credits many smaller events tied to Rodinia’s formation and breakup. The escarpment model may sit alongside those rather than replace them. For more on the canyon itself, read about native fish returning to Bright Angel Creek and the 94-year-old who hiked the Grand Canyon rim to rim. The paper is listed under DOI 10.1130/G55133.1. Further reading University of Southampton: Lost mega-escarpment may explain Grand Canyon's missing billion years Wikipedia: Great Unconformity Image: Mikenorton, CC BY-SA 4.0 via Wikimedia Commons This article was produced with AI assistance and reviewed by our Editorial Desk. How we work.",
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