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Was the grand canyon once a delta or a dune?

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Relevant answers:

Was the grand canyon once part of Mexico?
Yes!
Was the grand canyon once under water?
It was carved from a river so I guess you could say it once was
Was the grand canyon once filled with water?
No, It was formed by the erosion of the earth by Colorado River.
Why the grand canyon name is grand canyon?
That is what the people named it. They noticed the canyon as being rather large and bigger than any other canyon they had seen, so they named it the Grand Canyon.
What was the Grand Canyon befor it was the Grand Canyon?
At one time there were mountains as tall as Mt Everest. The Geologists know this from the rocks the bottom of the canyon known as Vishnu Schist.The geologist learn about these rocks with new machines...