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Sierra Club Program

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Date(s) - 05/27/2015
7:00 pm - 8:30 pm

TUD Board Room

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Roger Putnam will speak to the geology of El Capitan in Yosemite Valley. His talk will cover the current research regarding the formation of the rock El Capitan is made of and how that rock is continually eroding to produce its iconic shape. The talk will also cover how this research is accomplished: using modern remote sensing technology coupled with extreme rock climbing.

Roger teaches geology at Columbia College and Merced College and is an active research geologist in Yosemite Valley. He has many publications on the geology of the Valley, the most famous of which is the geologic map of El Capitan. This is the first geologic map of a 1 km tall granite cliff and was featured in National Geographic. He is also a top bigwall climber in Yosemite, with 25 ascents of El Capitan, the fastest of which took him just under 6 hours.

Please join us for Roger’s presentation Wednesday, May 27 at 7PM in the TUD Boardroom at 18885 Nugget Blvd, Sonora. Refreshments will be served.