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Castlegar, B.C.
Canada
1249 Posts |
Posted - 11/24/2003 : 12:08 PM
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Has anyone ever wondered what caused that white line in road cuts and river banks in the similkameen ?
Answer: the largest volcanic eruption ever recored, by Mt Mazama (now called "Crater Lake Oregon" some 7,300 years ago and spread ash through out B.C.
The book: geology of B.C. "a journey through time" |
Edited by - Kodiak on 11/24/2003 12:10 PM
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Maple Ridge, BC
Canada
79 Posts |
Posted - 11/26/2003 : 8:40 PM
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| You mean the geographical shape of crater lake was once the "top" circle of some mountain years back then? |
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Vancouver, BC
Canada
444 Posts |
Posted - 11/26/2003 : 10:00 PM
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There was a program on either the Knowledge Network or Discovery Channel a few years back, that mentioned that layer of ash visible in eroded banks of the Similkameen and also in core samples taken from lake bottoms in the Okanagan. Same program also mentioned Mt. Meager and Garibaldi dormant volcanoes and evidence in sediments of their past eruptions. Interesting stuff if you're a fellow geo-geek :)
Check out the Crater Lake park website for more info: http://www.nps.gov/crla/home.htm
Hmm, I guess this is kinda OT for a trail/trip report, sorry. But, hey while we're OT ... I spent Feb 2003 here: http://www.mvo.ms/
Missed the July eruption by 5 months, but still saw some incredible volcanic activity.
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 opinionated-stove huggin'-fleece wearin'-arse burnin' hill virgin
Here
Canada
4642 Posts |
Posted - 11/26/2003 : 10:14 PM
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If you look close enough you can see evidence of ancient volcanic activity all over our province. The town of Falkland is situated just inside the huge caldera of an old volcano (bigger than Crater Lake/Mt. Mazama) which errupted about 30 million years ago. The mountains around Kamloops are an example of rift volcanism. You will find plugs, dikes, maars, and smaller calderas in that area.
Meager, the Garibaldi complex, Wells Gray, Edziza, and an area just north of Terrace are examples of more recent volcanic activity.
Here's an interesting link to Canadian Volcanoes.
http://vulcan.wr.usgs.gov/Volcanoes/Canada/framework.html
If you want to see a cool local version of Crater Lake, check out Logger Lake just outside of Whistler.
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....."Know the Truth and the Truth shall set you free." |
Edited by - Hiker Boy on 11/26/2003 10:14 PM |
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Castlegar, B.C.
Canada
1249 Posts |
Posted - 11/28/2003 : 11:46 AM
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I read somewhere that even the Lions are a ancient volcanic plug ? anyone know ?
Lone Butte in the Cariboo is named after it's most famous geographical feature, a old lava plug standing high above the town. |
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opinionated-stove huggin'-fleece wearin'-arse burnin' hill virgin
Here
Canada
4642 Posts |
Posted - 11/28/2003 : 5:41 PM
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I can't find anything in my volcano texts on the Lions in particular however if they are granite, they could possibly have some sort of volcanic link (green stone volcanism). The Stawamus Chief is a pluton, similar to a plug.
Now why you may ask does Hiker Boy show so much interest in volcanoes?...My Dad is a retired geological (mining) engineer and I picked up the interest naturally from him and the vacations we always took to geological locations of interest and rock hounding. Now oyu know why I spend so much time in hotsprings and up the sides of mountains like Mt. Baker!
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....."Know the Truth and the Truth shall set you free." |
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B.C geology trivia
