Chapter 134. Making History

As the sun went down, Edmund, Alice, and Sky moved to the camping area. By the time night came, the tent was already standing perfectly.

"Oh, so this plateau was uplifted by tectonic activity, but the Colorado River wasn't? That's why it remains at the bottom of the canyon?" Sky asked with round eyes.

Edmund stroked his chin. "Yeah, something like that."

"Then each layer on the canyon wall is from a different era? The lower it is, the older its age is? The bottom one is a billion years old?" Sky's head rose even higher, just like her tone.

"Yes."

Sky's amazement wafted quickly into the air. "Wow! I don't know how long a billion years is. But I guess it's a very long time! Dinosaurs might have stepped on it. If that's the case, let's trample the ground around here, Papa. Our footprints should also be