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Author Topic: BIBE Geology  (Read 1184 times)  Share 

Offline BigBendHiker

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BIBE Geology
« on: April 15, 2007, 09:13:04 PM »
An interesting website on BIBE geology...

The website mentioned "In Big Bend National Park, Mariscal Mountain represents the southernmost extension of the Rockies in the United States".  Actually, I think they have it wrong.  The Rockies are the northernmost extension of Mariscal Mountain and BIBE.  All kidding aside, it is a good webiste.  Enjoy.

http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_big_bend.html

BBH
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Offline Goldilocks

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BIBE Geology
« Reply #1 on: April 15, 2007, 09:43:01 PM »
I could be very wrong about this, but at some point I read somewhere that the Chisos and the mountains in and around Big Bend were not considered part of the Rockies at all.  They were formed separately.  I don't remember the source of this info and I could be way off base.  Anyone else have any info about this?
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Offline 01ACRViper

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BIBE Geology
« Reply #2 on: April 17, 2007, 11:51:46 AM »
Quote from: "Goldilocks"
I could be very wrong about this, but at some point I read somewhere that the Chisos and the mountains in and around Big Bend were not considered part of the Rockies at all.  They were formed separately.  I don't remember the source of this info and I could be way off base.  Anyone else have any info about this?


this is true, the chisos were formed as a result of magma rising to the surface as a result of faulting between 38 and 35 million years ago. mariscal mountain (and sierra san vicente for that matter) was formed by the dragging of a subducting oceanic plate under the north american plate, causing folding during the laramide orogeny that lasted from  ~75 MYA to ~40 MYA. so the same process that built the rockies built mariscal mountain, but not the chisos and other volcanic features of the park/area.
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