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    Northwest Geology Field Trips, by Dave Tucker, is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 United States License. You can use what you find here, repost it with attribution to the author, "remix" it for your own purposes, but may not use it with the intent of making money off of it.

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Geologic tour along the Dallas Road Waterfront Trail, Victoria B.C.

Dark dike of magma invaded a larger body of pale felsic magma. The dike was broken apart. This is at Holland Point. Photo by Glenn Jareshko.

Fascinating geologic relationships can be seen  at Holland Point.

The third geology field trip along the city of Victoria’s shore has been added to the website. This one walks the city’s south shore along the Dallas Road waterfront trail from Clover to Holland Points. The trip description is largely the work of Gerri McEwen, who just completed her undergraduate honors thesis on these rocks at University of Victoria.

The thrust fault has placed older rocks on top of younger rocks.

Southern Vancouver Island thrusting has placed older rocks in the hanging wall over younger rocks in the footwall. These terms are explained in the Dallas Road field trip.

The relationships between these coast rocks are complex. There has been repeated intrusion, faulting,and metamorphism during accretion of an island arc and offshore terranes against Wrangelia after the latter giant terrane had collided with North America. Do you know the meaning of the terms ‘hanging wall’ and ‘foot wall’? Go to the Dallas Road field trip webpage to better understand the origin of these terms.

Some of the rocks are beautiful and well worth the visit. Take your camera!

Fragrance Lake addendum: Where quartzite in the till comes from

Broken surface of quartzite.

Broken surface of quartzite.

I’ve been asked about the source for the quartzite clasts in Puget Lowland glacial till. They are diagnostic of a British Columbian provenance for the Puget Lobe of the Vashon advance, and the great glaciations that preceeded that one. Go to the quartzite page, where I discuss the source for these pebbles, and attempt to confuse everyone because there are two kinds of quartzite.

Victoria’s waterfront geology, Part 2: Songhees Point

Glacial scours in bedrock at Songhees Point. Looking south across the narrow entrance to the Inner Harbo(u)r. B. Hardwick photo.

Bud Hardwick’s second article on geologic features in the Victoria area has been published on Northwest Geology Field Trips. This trip takes a stroll along the waterfront promenade of Westsong Way, focusing on glacial erosion features. He also tells us a bit about the native traditions at Songhee Point along the way. Read Bud’s article here.

Victoria’s waterfront geology, Part 1: Harling Point

Harling Point, The Harpoon Erratic, and Migmatite Bedrock

The Harling Point erratic. This is a panoramio photo on Google Earth by crobinso2010. http://www.panoramio.com/photo/56782186

Bud Hardwick of Bellingham sent us a report on geology (and the Chinese cemetery) at Harling Point on Vancouver Island, in the Victoria-Oak Bay area. Read it here. The trip features a landmark erratic, and migmatite bedrock. This is the first in a pair of articles Bud sent. The next will be to Songhees Point on the west shore of Victoria Harbor. Stay tuned, it will appear on Northwest Geology Field Trips later this week I hope.

A portion of the Chinese cemetery at Harling Point. There may be as many as 1000 burials here. Bud Hardwick photo.

Roadside geology of Southern British Columbia- a guidebook review

I have just posted a favorable review of the reprinted edition of Roadside Geology of British Columbia, by Bill Mathews and Jim Monger. This is surely among the best books in this series, with much more detail and descriptive geology than the Washington volume. You’ll find the review over at the Geology Guidebooks page.

Update to Capricorn debris flow, Lillooet River, British Columbia

The debris flow deposit in Meager Creek runs north (toward top of photo) and at one time plugged the Lillooet River, running left to right.

Terry Spurgeon, of Coquitlam BC, sends us an updated description and guide to the deposit left by one of Canada’s largest recorded debris flows.  Click to go to the new report. This remarkable event and its deposit were first explored in these pages back in early October. The area is rapidly changing. I must apologize to Terry for taking so long to get this posted. Current weather conditions now make this area difficult to visit. We’ll look forward to further updates on this dynamic place from Terry.

Terry’s earlier contributions include the Shasta Court and Aldergrove erratics, and an initial description of the Capricorn Creek debris avalanche and debris flow.

Dave Tucker