That's quite the website. They put this under Lifestyle?
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Home/Life Style/The Grand Canyon lacks a billion years of geological history
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And you read the article through a hole left in the advertisements, but (at this time in this location) they can't display the illustration above "(Image credit: Barra Peak)".
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As far as I know. Nobody can point to what happened to the missing material.
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Where it's not:
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Valles Marineris: The Grand Canyon of Mars | Science ...
https://science.nasa.gov/valles-mari...nd-canyon-mars
The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep.
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http://www.thunderbolts.info/tpod/20...06vmridges.jpg
That looks pretty odd for water erosion.