Sunday, November 6, 2011

Serious Canadian Folds

Since finishing up my extraordinary summer season as a park ranger at Yellowstone I find I have a lot of free time bouncing around in my head. I also realize that here in southern Utah I am surrounded by truly amazing geology and nearly endless hiking opportunities. I love the desert! Still, there is that irresistible tendency to enjoy a daydream or two of past travels and future adventure possibilities…

For some reason I have always been drawn to the Canadian Rockies, like a rose waiting to be plucked and worn in my hair. I do not pretend to know much about the geology of the Canadian Rockies, but that in no way diminishes the fascination these rocks hold for me. I have been there twice in the past six years, to Yoho, Jasper, and Banff National Parks, and it isn’t nearly enough to satisfy me. I’ve got to get back to these awesome rocks. With mountains like this, can you blame me? 

Isoclinal_folding_P_Lougheed_Prov_Park_AB_CA
Isoclinal folding photographed in the rain

Iosclinal_fold_Peter_Loughheed_ProvPark_AB_CA


The above two photos were taken on my last trip in 2008 when I was travelling with two acutely geology–crazed friends. I had hiked trails in Banff and a glacier in Jasper, and been a volunteer assistant guide on a hike to the Walcott Quarry in Yoho with the Burgess Shale Geoscience Foundation. We were on our way home to Utah, heading south from Canmore, Alberta on densely forested Highway 40 through Peter Lougheed Provincial Park in Kananaskis Country. It was a gray, drizzly early morning as my car’s windshield wipers knocked a squeaky beat with the monotonous drone of tires rolling on asphalt. My friends were just ahead on the wet, winding road. Somewhere we paused for a moment to watch a small grizzly ignore us as it fed by the side of the highway, but sadly it appeared there would be little other opportunity for any final sightseeing on this part of the trip. It was just too foggy. 

But then through the misty towering evergreens this jagged mountain thrust itself into view, totally taking my breath away. I nearly drove off the pavement and into the trees; I was absolutely awestruck by the sight of these seriously uplifted, tightly folded rock layers. It had to be among the most captivating scenes I had ever witnessed. I slammed on my brakes to pull over to the shoulder while my friends sailed onward, disappearing around a bend in the highway. 

What circumstances in the Earth’s crust resulted in these rock layers shooting skyward like this? Over the few intervening years since those amazing journeys, the thoughts and ideas that I had assembled about Canadian geology have become a bit fuzzy. Nevertheless, as the person guilty of starting this thread I will gladly drag out my images and maps and reference books, along with a journal I kept, and try to (once again) wrestle some sense out of it all. And so, over the next who–knows–how–long, we will peer back into the past six years (or will it be at least 500 million years?) and continue our sojourn into the spectacular Canadian Rockies.

11 comments:

  1. Right on! You are on the list! My "two friends" and I have talked about going back one of these days. I definitely want to hike the Iceline Trail in Yoho - missed it in 2008.

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  2. The Colorado Rockies were the first mountains to capture my heart 35+ years ago when I knew absolutely nothing about geology. Look forward to this story.

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  3. It will be too much fun for me to have a new look at all my photos, maps, and books I collected on the 2 trips, and then share my insights with everyone!

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  4. A very familiar scene-this is my stamping-ground! This is the north facing end of an eastern ridge of Mt. Tyrwhitt at Highwood Pass (50.589017 N, -114.998749 W). I've hiked across the top of the ridge in this scene. The rocks are Lower Cretaceous continental beds (coal-bearing) of the Kootenay Group (Mist Mountain and Elk formations). They have been squished in the footwall of the Lewis Thrust, which would be just out of the photo to the right (=west; the photo is looking south). The Lewis Thrust, of course, is one of the major thrusts in the front ranges of the northern Rockies and continues southward into Montana.

    Looking forward to seeing more!

    --Howard

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  5. Wow! Very interesting. Thanks so much for the input, Howard. Very much appreciated. I never would have been able to go into such detail about the formations since I never did much in the area except nearly careen off the road looking at the peaks. Your comments give me a jumping off point for study, though. The photo is indeed looking south.

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  6. Nina--

    You're welcome! There's a map available for this area:

    McMechan, M.E. 1998. Geology, Peter Lougheed Provincial Park, west of fifth meridian, Alberta. Geological Survey of Canada, Map 1920a.

    You can download it from the GSC map search site, here:

    http://apps1.gdr.nrcan.gc.ca/mirage/db_search_e.php

    (Enter "1920a" into the Number search field. Maps are in MrSid or JPEG format.)

    --Howard

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  7. Thanks for the link, Howard. I will definitely take a look. I do have the Geological Highway Map of Alberta, along with a couple other guidebooks which I'll be using. Meanwhile this morning I'll be taking a hike on some southern Utah Permian limestones.

    Stay tuned!

    How did you happen to find my blog? I'm always interested in how people find me.

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  8. Nina--

    I probably found your blog either on www.geobulletin.org, which is usually my first stop when I'm reading blogs, or on Silver Fox's blog list.

    Have fun in the Permian!

    Cheers, --Howard

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  9. Sounds like a great road trip! I think I should dig through some old photos (a few from the Jasper et al, though not over into Alberta, I don't think) and see if I have anything useful to digitize.

    Am really looking forward to reading more about your trip. :)

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  10. SF - So glad to have you along for the adventure. Enjoy the ride!

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