Field Trips

COGS Offers field trips to select destinations of geoscience interest.

  • You must be a member of COGS, or a guest of a member, to participate in field trips.
  • Please arrive at the field trip meeting location 5-10 minutes early to get signed in.
  • Check the weather report and plan accordingly. Remember that weather conditions can change quickly in central Oregon! Dress in layers and wear sturdy hiking shoes.
  • Bring plenty of water and snacks, pack a lunch if specified in the field trip description.
  • Please leave your pets at home – dogs are not allowed on COGS field trips. 

    Geo-Explorations

    More informal hikes and bike rides to geologically interesting sites and are coordinated via COGS's Meetup at: https://www.meetup.com/central-oregon-geosciences-society/

    On the COGS Meetup site, you will find a red button stating "join this group". Once you have joined the group, you will start receiving notices of COGS Meetup events.

    COGS Field Trip & Geo-Exploration Waiver


    Upcoming Field Trips

      • 17 Sep 2022
      • 9:00 AM
      • 18 Sep 2022
      • 4:00 PM
      • TBD, Bend Area


       

      Save the Date -More info to follow

      Registration Opens Sept. 1

      Deschutes Formation and Tumalo Volcanic Center Field Trip

      Co-Led by Jen Mcleod & Dr. Adam Kent

      Saturday Sept. 17,

      & Sunday Sept 18.

       

      Please join Jen McLeod, doctoral candidate, and Dr. Adam Kent, both of Oregon State University, for a two day field trip focused on the Deschutes Formation and the Tumalo Volcanic Center.

      The Deschutes Formation (~7.5-5 Ma) and Tumalo Volcanic Center (~0.6-0.13 Ma) represent two distinct periods of explosive silicic volcanism within central Oregon. These two localities are ideal for studying the processes that control silicic melt formation near the Cascade Arc, where high silica eruptive products are otherwise relatively rare. The Deschutes Formation is North America’s most recent ignimbrite flare-up, which includes ≥78 distinct explosive deposits located primarily within the modern Deschutes Basin. The Tumalo Volcanic Center, which lies between Three Sisters Volcanic Center and the city of Bend, OR, is a cluster of volcanic vents with several associated large ignimbrite deposits (e.g., the Tumalo Tuff, Shevlin Park Tuff, and Desert Springs Tuff). The tectonic constraints controlling melt formation at both the Tumalo Volcanic Center and the Deschutes Formation have long been an area of interest.

      During this two day field trip we will compare the eruption histories of the Tumalo Voclanic Center and the Deschutes Formation and explore the regional tectonism that contributed to both of their development. We will first visit the Deschutes Formation to observe its remarkable ignimbrite flare-up stratigraphy and discuss its possible relationship to extensional processes. On the second day of the field trip, we will be visiting the Tumalo Volcanic Center to delve into its geochemical connection to the Cascades Arc and the nearby High Lava Plains volcanic track. During this field trip, we will be sharing newly acquired 40Ar/39Ar ages, geochemistry, and source information for Tumalo Volcanic Center eruptive units.

      Registration opens Sept. 1.  This trip is limited to 15 participants.  All participants must be a COGS member or a guest of one and agree to the COGS liability waiver which requires all participants to self certify that they are fully vaccinated and boosted.  Please leave your pets at home.



       


    Central Oregon Geoscience Society

    Email: COGeoSoc@gmail.com
    P.O. Box 2154,  Bend, Oregon 97709

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