In so doing it cut out the upper canyon, this gorge eighteen miles wide.

Then came a second uplift, giving the river a much greater impetus toward the sea, which cut out the second, or marble canyon.

Now as to the mountain range crossing the canyon at right angles.

It must have come with the second uplift.

If so, did it dam the river back into another inland sea, and then wear down into that red perpendicular gorge we remember so well?
Or was there a great break in the fold of granite, which let the river continue on its way?
Or was there, at that particular point, a softer stone, like this limestone here, which erodes easily ?" "You must ask somebody wiser than I." "Well, let's not perplex our minds with its origin.