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6 June 2014

Friday fold: differential weathering of carbonate intraclasts in mudstone

Howard Allen is the documentarian of this week’s fold: Howard writes that this is: Middle Cambrian Chancellor Formation rock with recessive weathering intraclasts(?). Hamilton Lake trail, Yoho National Park, British Columbia. My interpretation of this one is a little shaky–it was raining when I took the photo (in 1982) and I was hiking with a non-geologist friend, so I didn’t linger at the outcrop or record the precise location. I …

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14 March 2014

Friday fold: rolled boudin

Howard Allen returns with a Friday fold contribution for this week. He says: Not exactly a fold, but I thought you’d like this rolled boudin(?) (quartz) in a muscovite garnet schist (note garnets above the lens cap). This specimen is also from the Shuswap Metamorphic Complex, north of Sicamous, British Columbia. Lovely. Thanks for sharing, Howard!

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21 February 2014

Friday fold: Shuswap marble, British Columbia

Howard Allen, a blog reader from Canada, digitized a bunch of folds for us from his old Kodachrome slides. You’ll be seeing selections from these images over the weeks to come. Get psyched! There are some great folds in this batch. Here’s the first: Howard’s description: 3D folded marble, Shuswap Metamorphic Complex, north of Sicamous, British Columbia. Specimen was bulldozed out of the way for a logging road. Photographed in …

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31 January 2014

Friday fold: Okanagan gneiss

Todd Redding is our genorous sponsor for this week’s Friday fold. Todd reports that this boulder is derived from the Okanagan Metamorphic Complex near Penticton, British Columbia, Canada. He gives its lat/long as 49°28’14.10″N, 119°30’23.14″W. Did you spot the small fault in there, too? Thanks for sharing, Todd!

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6 November 2013

Natural Bridge, Yoho National Park: Bedding/cleavage relationships

Check out the scene at Natural Bridge in Yoho National Park, British Columbia, Canada: Don’t confuse this “Natural Bridge” with the one in Virginia. Here, in the western Canadian Rockies, the structural geology is much better. You may recall that I’ve previously featured outcrops from nearby this site as a Friday fold. It’s a great place for examining bedding / cleavage relationships in the rocks. Here’s the previous picture, annotated: …

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21 June 2013

Friday fold: a lovely three-dimensional exposure

The Friday fold series returns to Kootenay National Park in Canada for a look at some folded Cambrian limestones.

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17 May 2013

Friday fold: Rorschach blot

The broad symmetry (with smaller-scale variations) of this fold caught my eye as particularly artful when I saw it (at Howard’s recommendation) last summer in the Canadian Rockies: Kootenay National Park, British Columbia, Canada. I see a butterfly. What do you see? Happy Friday.

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7 September 2012

Friday folds: Selkirk Fan

The Friday fold is a selection of five fold photos from the Selkirk Fan in the Omineca Belt of British Columbia, submitted by structural geologist Marek Chichanski of De Anza College (California).

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31 August 2012

Friday fold: Natural Bridge area, Yoho National Park

The Friday fold, delayed by a week from last week’s contest, appears in Yoho National Park, British Columbia, near the “Natural Bridge” over the Kicking Horse River.

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13 August 2012

Class portrait at the Walcott Quarry

Here’s my crew from July’s Regional Field Geology of the Canadian Rockies course, checking out the Burgess Shale at the Walcott Quarry in Yoho National Park. A couple of the locals joined us for this portrait. Original photo courtesy of Stephen Smith, modified by CB

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