Upcoming Presentations

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• The Changing Skyline: Photo Documentation of 100 Years of Landscape Change in the Central Oregon Cascade Range

  • When
    26 Nov 2024
  •  
    5:30 PM
  • Location
    Online and in-person at Worthy Brewing

  Jim O'Connor

  U.S. Geological Survey
  

  
  

  
  

  Register for the Zoom meeting

  
  

  
  

  
  

  
  

  
  

  During the summer of 1920, Frederick William Cleator (1883–1957), a U.S. Forest Service recreational planner, surveyed and sign-posted the Oregon Skyline Trail. This trail, first laid out between Crater Lake and Mount Jefferson, was a predecessor of the Pacific Crest Trail, which decades later completed Cleator’s prediction of a recreational trail running from Mexico to Canada. During his survey, Cleator made several hundred photographs from peaks, forest glens, lake shorelines, and scenic vistas. These photographs show the landscape of the time. In the summer of 2020, with the help of many friends and colleagues, Jim O’Connor essentially retraced Cleator’s steps, re-photographing the landscape, many scenes 100 years to the hour from Cleator’s photos. These centennial matches show — in ways otherwise difficult to know or describe — the changing skyline, the changing forests, the changing glaciers, and the changing human uses of the central Oregon Cascade Range. 

  
  

  
  

  
  Please join us at:

  Worthy Brewing (eastside location)

  495 NE Bellevue Drive, Bend

  In the Beermuda Triangle Room

  
  

  5:30 pm social hour

  7:00 pm presentation

  
  

  COGS talk are free and open to the public -- all are welcome! Please join us for the social hour before the presentation.
  
  All presentations are also live-streamed through Zoom. There will be a registration link at the top of this page as we get closer to the date of this presentation.

  
  

  Show details
• How forests grow their own pot: Quantifying the role of trees as wind-wiggling, tap-dancing, and crowbar-wielding architects and builders

  • When
    25 Feb 2025
  •  
    5:30 PM
  • Location
    Online and in-person at Worthy Brewing

  Jill Marshall

  Portland State University

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  In thin-soiled settings, we presume that trees play a significant role in converting rock into mobile sediment via physical weathering, with models centered on wind-driven tree throw. By combining novel force sensors at the tree-rock boundary with precipitation, solar radiation, wind, tree sway, and acoustic emission data, Jill Marshall has begun to quantify how species differences, wind, and root-water uptake contribute to tree-driven rock cracking. Her data suggests that changes in climate and forest structure may greatly influence tree-driven physical weathering and the rates at which trees grow their own soil pots.

  
  

  
  Please join us at:

  Worthy Brewing (eastside location)

  495 NE Bellevue Drive, Bend

  In the Beermuda Triangle Room

  
  

  5:30 pm social hour

  7:00 pm presentation

  
  

  COGS talk are free and open to the public -- all are welcome! Please join us for the social hour before the presentation.
  
  All presentations are also live-streamed through Zoom. There will be a registration link at the top of this page as we get closer to the date of this presentation.

  
  

  Show details