re: Now Closed: I'll answer any question you have about ROCKS!

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OK, checked my notes:

1.4 billion Pikes Peak Granite
1.7 billion Royal Gorge Gneiss

I felt like 1.7 was floating in my brain...just had to make sure.

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Thanks Pectus. I find geology really interesting. I never paid much attention to it until I moved out here but now I'm surrounded by it. It's really interesting to drive around and look at how the rock types change as you travel. For example, around here, it's red sandstone (eroded remnants of the ancestral Rocky Mountains) with granite intrusions such as Pikes Peak. Further south it's more volcanic. You see dikes and sills and old dormant volcano cones.

Also, I think I read that the Pikes Peak batholith that Pikes Peak formed from is 1.06 billion. But there are other ones with the same K-feldspar granite that are older. I'm guessing the one around Canon City (Royal Gorge area) is one such.