Field Trips

COGS offers a variety of field trips led by experts on Oregon's geology.


Informal hikes, bike rides, and other explorations of geologically interesting sites.

To participate in field trips and geo-explorations:

  • You must be a member of COGS, or a guest of a member, to participate in field trips and geo-explorations.
  • You must sign the COGS field trip and geo-exploration waiver.
  • Please arrive at the 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. 

    COGS Field Trip & Geo-Exploration Waiver

    Upcoming Field Trips

      • 14 Sep 2023
      • 6:00 PM
      • 17 Sep 2023
      • 5:00 PM
      • Summer Lake, Oregon

      Geology of Oregon's High Desert

      Workshop Instructor: Daniele McKay

      COGS has partnered with PLAYA art and science center in Summer Lake, Oregon, for a three day field experience in Oregon's high desert.

      This workshop will explore the geology of the Summer Lake, Christmas Valley, and Lake Abert regions with daily field trips, evening presentations, and group dinners provided by PLAYA. Areas visited will include Summer Lake, Ana River, Hole-in-the-Ground, Fort Rock, Crack-in-the-Ground, and the Lake Abert area. Field trip stops will highlight the region’s remarkable geology and cultural history, exploring active faulting and volcanism, records of past climate change, and archaeological sites.

      This workshop is organized by PLAYA and registration is open to everyone.

      This is not an official COGS field trip, but COGS members are encouraged to register! Our partnership with PLAYA allows us to plan a three day field experience that includes comfortable accommodations, a beautiful lodge for evening programs, and group dinners (PLAYA's meals are fantastic!).

      Please see the Geology of Oregon's High Desert Workshop on the PLAYA website for more information and to register.

      For details about the facilities at PLAYA, see the Campus Life section of their website.

      The campus lodge at PLAYA.

      Group dinners on the patio.

    Past Field Trips

    26 Oct 2022 Mafic Volcanism!
    30 Sep 2022 Thomas Condon Paleontology Center tour and field work experience
    17 Sep 2022 Deschutes Formation and Tumalo Volcanic Center Field Trip
    24 Aug 2022 Melting Glaciers, Failing Dams: The 1966 Debris Flow from No Name Lake Field Trip
    5 Aug 2022 Faults in the Strawberry Mountains
    1 Aug 2022 Whychus Creek Geo-Exploration
    26 Jun 2022 Lava Cast Forest Field Trip
    4 May 2022 COGS Geo-Exploration: Gray Butte
    7 Apr 2022 COGS Geo-Exploration: Barnes Butte, Prineville, OR
    3 Dec 2021 COGS Geo-Exploration: Farewell Bend Loop
    1 Dec 2021 COGS Geo-Exploration: Flatiron Rock in the Oregon Badlands
    6 Aug 2021 Ochoco Mining District Field Trip by Carrie Gordon & Derek Loeb
    28 Jul 2021 Deschutes River Geohydrology Field Trip
    27 Jun 2021 COGS Field Trip: Fault Scarps of Mt. Hood (south side)
    27 Mar 2020 Monthly Tours of the OSU-Cascades Pumice Mine
    4 Oct 2019 Deschutes River Field Trip
    14 Sep 2019 Mount Hood Field Trip
    22 Jul 2019 Newberry Volcano Field Trip
    13 Jul 2019 Wildcat Mountain Caldera Field Trip
    28 Jun 2019 Fire and Water: Recent mafic volcanism of the central Oregon Cascades
    16 May 2019 Geology of the Scout Camp loop trail along the middle Deschutes River
    27 Apr 2019 Geology of Shevlin Park
    3 Nov 2018 Hydrovolcanoes of Central Oregon Field Trip
    23 Oct 2018 Crooked River Caldera Field Trip
    23 Sep 2018 Mount Bachelor Volcanic Chain Field Trip
    14 Sep 2018 Clarno Fossil Beds Field Trip
    5 Aug 2018 Glacial Geomorphology of the Santiam Pass Area Field Trip
    14 Jul 2018 Lava Butte and Lava Lands Visitor Center
    10 May 2018 Deschutes Formation, Whychus Creek Geologic Field Trip
    1 Apr 2018 Geology of Riley Ranch Nature Reserve Field Trip

    Central Oregon Geoscience Society

    P.O. Box 2154,  Bend, Oregon 97709

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