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Fragments from Floyd

Alligator-back Formation: I’m Glad I Asked

A shale-like rock in the Blue Ridge: What's going on?

Why do the rocks at 3200 feet at the “very edge” of the Blue Ridge look as if they were laid down by water, layer after layer, when it is from harder, igneous rock that this geological province is formed (at least in my limited understanding?) Horizontally-layered dark mica-flecked rocks jut out across the ridge-tops like the vertical ridges along an alligator’s tail. What’s with that?

I asked a friend who asked a friend who knows, and who explained it nicely in his reply. I think he’d approve of it’s use for educational purposes. I know I learned something!

It’s detailed. I imagine eyes crossing. But for some nerdy types like me, this was immensely informative. Still not interested? Okay. You’ve forced me to talk dirty: metamorphic schist. So there.

I’ve put it up on my posterous page, just click the link.

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2 thoughts on “Alligator-back Formation: I’m Glad I Asked”

  1. The entire area I live in is underlain by metamorphic schist. Some of it contains large garnets in beautiful blue-gray layers. And you are right, it was a very interesting process that formed this wonderful metamorphic rock.

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