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Roadside geology of I-8 in CA
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CarGuru > Driving > Roadside geology of I-8 in CA 17 March 2005 10:25:24

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Roadside geology of I-8 in CA

The Roadtrippin' Moose 16 March 2005 09:04:50
 Hi all, I'm new. It's nice to know this group exists - I thought I was
the only one who took photos of road signs.

I'm also a former geologist, and I had a question about the roadside
geology of I-8. I was driving west from El Centro to San Diego a few
months ago. Just as I got into the Cleveland National Forest, near
Jacumba, I noticed a rock formation on both sides of the road with what
appeared to be large boulders embedded in a matrix.

I guessed it might be fault gouge (ordinary rocks churned up and
broken) from the San Andreas Fault, but I thought the fault ran east of
there. Does anyone have any information or theories about the rocks
there? Or is there a better newsgroup to post this question to?

I would have stopped and looked close-up, but I had to catch a plane in
San Diego.

Thanks for your help, and I'm looking forward to talking with you more!

Add comment
William Lynch 16 March 2005 10:35:45 permanent link ]
 in article 1110949490.621278.3­7180@f14g2000cwb.goo­glegroups.com, The
Roadtrippin' Moose at jordan.raddick@gmai­l.com wrote on 3/15/05 9:04 PM:
Hi all, I'm new. It's nice to know this group exists - I thought I was> the only one who took photos of road signs.>
I'm also a former geologist, and I had a question about the roadside> geology of I-8. I was driving west from El Centro to San Diego a few> months ago. Just as I got into the Cleveland National Forest, near> Jacumba, I noticed a rock formation on both sides of the road with what> appeared to be large boulders embedded in a matrix.>
I guessed it might be fault gouge (ordinary rocks churned up and> broken) from the San Andreas Fault, but I thought the fault ran east of> there. Does anyone have any information or theories about the rocks> there? Or is there a better newsgroup to post this question to?>
I would have stopped and looked close-up, but I had to catch a plane in> San Diego.>
Thanks for your help, and I'm looking forward to talking with you more!

The San Andreas Fault hits I-8 at the eastern edge of the Imperial
(Coachella?) Valley, but California has over 18,000 separate faults,
so this could easily be a smaller one.

Add comment
Dave 16 March 2005 21:34:49 permanent link ]
 http://quake.usgs.go­v/ might have info about which fault it was, they
have all kinds of maps of faultlines of California.

Dave

Add comment
Paul D. DeRocco 17 March 2005 10:25:24 permanent link ]
 
"Cameron Kaiser" <ckaiser@floodgap.c­om> wrote>
http://pasadena.wr.­usgs.gov/info/images­/SCA%20Faults.pdf lists the> Superstition Mountain and Hills faults, as well as the Imperial Fault,> in that region.

Looks like the Elsinore fault to me.

--

Ciao, Paul D. DeRocco
Paul mailto:p­derocco@ix.­netcom.com


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CarGuru > Driving > Roadside geology of I-8 in CA 17 March 2005 10:25:24

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