Notes From The Field – Revelstoke to the Okanagan

Finally we had a mostly sunny day! We began the day with a tour of the Revelstoke Dam. This dam was one of the last Canadian dams built within the Columbia River watershed. The dam area is really interesting because just across the highway from the dam is the Columbia River Fault zone – a Early to Middle Eocene crustal-scale, east-dipping, extensional fault zone that follows the Columbia River Valley near Revelstoke. Now that was a bit disconcerting for me as I looked at the zone while standing on the top of the dam structure. Our group split up after the dam tour, and I went with the group to the Okanagan Valley. Among our stops were: 1. Three Valley Lake for a look at the hanging wall of the Monashee decollment, Craigellachie, where the last spike of the Canadian Pacific Railway was set in 1885, and the Okanagan-Eagle River Fault zone. Below are some of the day’s photos….

Revelstoke Dam spillway

Revelstoke Dam spillway

 

Mass wasting in rocks cut by the Columbia River Fault Zone near the Revelstoke Dam.

 

Rocks of the Three Valley assemblage – pelitic gneisses and mica schists – are cut by mafic dikes.

The last spike cairn at Craigellachie.

The last spike cairn at Craigellachie. Note the coal train in the background going by the cairn.

 

Quest for the Eagle River fault zone.