Geology/formation: This area is part of the Colorado Plateau, the surface of which was once underwater (marine fossils found). The whole area was subject to a massive uplift several hundred million years ago. The roaring Colorado river started the water erosion we see today about 6-10 million years ago. Other water and weather/wind erosion contributed to big dig we see today. Study of the age of the earth can be observed in the layers of rock down to the bottom. Layers of rock at the top 250 million years old; rocks at the bottom date to early ages of the earth's formation, up to 2.3 billion years ago.
The South Rim is where most people go; it is more developed w/lodging, ranger tours and shops. However, Marlene and I felt it was too developed; and we were there when it was supposedly not very busy; not very peaceful to us. North Rim has a lodge right on the edge of the canyon, less busy, better views for my money; much less developed, much more peaceful; I could easily spend a day or two at the North Rim.
Pictures cannot do justice to the massiveness of the Canyon; it's just too big. We were happy we went there, but have seen other sights and views we enjoyed more. Nothing, however, anything close to the scale of the Big Dig.
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