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Posts treating: "Supergroup rocks"

Friday, 29 May 2015

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Grand Canyon Field Institute 10-Day Colorado River Rafting Trip - Part 2 Phantom Ranch to Diamond Creek 

Earthly Musings [2015-05-29 16:40:00]  recommend  recommend this post  (165 visits) info

 Cambrian,Carboniferous; US,TH
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Part 2 of this 10-day Grand Canyon raft adventure begins downstream from Phantom Ranch.The angular unconformity between the Grand Canyon Supergroup (lower tilted strata) and the Cambrian-age Tapeats Sandstone. Note that the Supergroup rocks are beveled to near horizontal suggesting a long period of erosion to plane them flat.Wider view of the same unconformity, exposed near Stone Creek in Grand Canyon (river mile 132). The lighter colored Supergroup rocks belong to the Bass Limestone and are [...]

Association of Applied Geochemists Rafting Trip Grand Canyon - April 9 to 16, 2015 

Earthly Musings [2015-04-26 21:27:00]  recommend  recommend this post  (172 visits) info

 Cambrian,Permian,Carboniferous; US,CA
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I was fortunate to lead a group attending a professional conference in Tucson Arizona down the Colorado River in Grand Canyon. It was wonderful to share the magic of the Grand Canyon with such an appreciative audience. In addition to the professionals attending the International Applied Geochemistry Symposium were six folks from my personal mailing list for trips, who couldn't resist traveling down the river with a bevy of helpful and enthusiastic geoscientists. It was an unqualified success - [...]

An Eight-Day Colorado River Trip Through Grand Canyon - Part 3 

Earthly Musings [2013-06-21 16:42:00]  recommend  recommend this post  (59 visits) info

 Cambrian
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The last part of this narrative involves traversing the Upper and Middle Granite Gorges. Grand Canyon has three inner gorges named Upper, Middle and Lower. These are where some of the best rapids are located as well as some of the best rocks.A view of the Upper Granite Gorge above the Phantom Ranch area.Near river mile 83 on the left is a small body of ultramafic rocks. These are rocks that were originally located in the earth's mantle but found their way to the surface in rare circumstances [...]

Salt casts from Purcell (Belt) Supergroup rocks, Waterton National Park 

Mountain Beltway [2012-07-23 14:45:32]  recommend  recommend this post  (97 visits) info

 Ordovician
I’ve previously mentioned the lovely salt casts that can be found in Mesoproterozoic argillites of the Belt (“Purcell” in Canada) Supergroup of the Canadian Rockies (including the North American portion of the Canadian Rockies: Glacier National Park and the Sevier fold and thrust belt immediately south of it). When I led my Rockies field class students over Alderson Pass / Carthew Summit in Waterton Lakes National Park, Alberta, last week,
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