Presentations are held on the 4th Tuesday from September to May


Please note that  COGS will be using Zoom until we are able to resume in-person meetings


Upcoming Presentations

    • 25 Jan 2022
    • 7:00 PM
    • Zoom Presentation


    Click HERE to register for this Zoom Presentation



    Bart Wills

    U.S. Forest Service










    Debris flows are common erosional processes in mountainous area around the world. Wildfires alter the normal hydrologic response in these areas by burning vegetation on steep slopes. Soils on these slopes that are exposed to rainfall events tend to act like pavement in regard to runoff, which increases the chances of debris flows. Debris flows are not well behaved events and will deposit material outside the fire perimeter, so it is important to warn people of these hazards. In this talk, Bart will discuss debris flows, how they start, where they deposit, and the hazards they present. He will also talk about the U.S. Forest Service post-fire Burned Area Emergency Response (BAER) team, the assessment of risk to critical values, and how debris flows can be mitigated. 

    • 22 Feb 2022
    • 7:00 PM
    • Zoom Presentation

    Emily Johnson

    U.S. Geological Survey





    "Monogenetic" volcanoes – small volume volcanoes like cinder cones that typically erupt only once – are the most common volcano type on Earth, and in Oregon. In this talk, Dr. Emily Johnson (USGS) will provide an overview of eruptions from these volcanoes, and how we can use the characteristics and chemistry of their deposits to learn about what drives these eruptions and the hazards they present. The talk will focus on one of the youngest monogenetic volcanoes in Oregon: Blue Lake crater.

    • 22 Mar 2022
    • 7:00 PM
    • Zoom Presentation

    Trenton Cladouhos

    Cryq Energy





    Forty years of geothermal exploration and attempted development on Newberry Volcano has yet to result in geothermal electricity production. Since the National Volcanic Monument was formed in 1990, all drilling efforts have been on the volcano flanks where deep wells have encountered very high temperature at depth (320 C and 3 km), but no significant permeability. From 2010-2015, AltaRock Energy used the latest technologies and Enhanced Geothermal System (EGS) methods to stimulate NWG 55-29, a well drilled by Davenport Newberry in 2008. That project ended with significant progress but not enough funding to drill a production well and prove the EGS resource. Private and public funding for geothermal research and development, which has been cyclical depending on the price of oil, global warming concerns, and politics, is back up. New plans to drill deeper at Newberry to access temperatures above 400 C are being made by AltaRock and a new drilling technologies partner, Quaise Energy. 

    • 26 Apr 2022
    • 7:00 PM
    • Zoom Presentation

    Kathryn Watts

    U.S. Geological Survey







    Rare earth elements (REE) are ubiquitous components of our modern society. Though at the bottom of the periodic table, and out of mind for most people, these elements are in our cell phones, computers, vehicles, and even light bulbs. The uses of REE have only increased through time, and they are now playing a key role in the renewable energy revolution. Domestic sources of REE are scarce, with only one operational mine in the country, the Mountain Pass REE mine in southeastern California. It takes unusual geologic conditions to make an REE deposit. Mountain Pass owes its REE abundance to magmas that formed 1.4 billion years ago. A very rare type of magma, called carbonatite, crystallized exotic minerals that concentrated REE to economic grade. Research by the U.S. Geological Survey (USGS) is delineating the physical and chemical paths by which this geologically unique and economically important REE deposit formed. This work builds on USGS research extending back to the deposit’s discovery in the early 1950s. The focus of this lecture will be on the past, present, and future of the Mountain Pass mine through a geologist’s lens.

    • 24 May 2022
    • 7:00 PM
    • Zoom Presentation

    Marli Miller

    University of Oregon








    We all know that Oregon hosts innumerable places to see its incredible geology, but many of those places – even some right next to each other – can seem completely unrelated. How do they all fit together?

    On May 24, Marli Miller will present a wandering photo-tour of Oregon’s geology that highlights field trip localities around our state – and brings them together to tell Oregon’s geologic story. She got the inspiration for this talk while researching the many disparate localities for her latest book “Oregon Rocks! A Guide to 60 Amazing Geologic Sites,” published in April, 2021 with Mountain Press in Missoula.

    Marli has authored and co-authored several books on the geology of Oregon and Washington, including Roadside Geology of Oregon, Roadside Geology of Washington, Oregon Rocks! A Guide to 60 Amazing Geologic Sites, and Colorado Rocks! A Guide to Geology Sites in the Centennial State.



Past Presentations

23 Nov 2021 Tectonic evolution of the Cascadia margin in southwest Oregon during the past 55 million years
26 Oct 2021 Evaluation of slip history and Holocene activity on faults in the Strawberry Mountains
28 Sep 2021 Timing and controls on growth of the Oregon Basin and Range Province
25 May 2021 I Date Rocks: A Geochronology Love Story
27 Apr 2021 Water in the Deschutes Basin: 2020 Hindsight – What Happened?
23 Mar 2021 The fragmented death of the Farallon Plate
23 Feb 2021 Our Vanishing Glaciers, Part II
26 Jan 2021 The Next Great Cascadia Earthquake - How did we get here?
24 Nov 2020 What lies under recently active Cascades volcanoes?
27 Oct 2020 Mapping the Magmatic Pathways Beneath Volcanoes from Newberry, Oregon to Santorini, Greece
22 Sep 2020 Red Rocks from Earth to Mars
26 May 2020 The history and science of glacier change in the western US and a peek into their future
28 Apr 2020 Volcanoes in Our Backyard: Understanding and Mitigating Volcano Hazards in Central Oregon
24 Mar 2020 I Date Rocks: A Geochronology Love Story
25 Feb 2020 Mountains, Earthquakes, and Landslides: Using Lasers to Peer Behind Cascadia's Green Veil
28 Jan 2020 Three Newly Discovered Fault Systems in Oregon
26 Nov 2019 Oregon's Checkered Past
22 Oct 2019 The Other Flood: Ice-age Bonneville Flood on the Snake River
24 Sep 2019 Tectonic History of the Coos Bay Basin and its Relationship to Pacific Northwest ‘Siletzia’ Tectonics
10 Aug 2019 Newberry Volcano: A sleeping giant with two bubbling lakes
28 May 2019 Holocene Glacial and Paleoclimate Reconstructions in the North Cascades, Washington
23 Apr 2019 A new look at “old” tuffs from Newberry Volcano: Evidence for dynamic magmatic processes at a geologic crossroads in central Oregon
26 Mar 2019 Kīlauea's 2018 Fissure Eruption – Chronology, Processes, and Impacts of Kilauea's Largest Eruption in 200 Years
26 Feb 2019 Mountains, Earthquakes, and Landslides: Using Lasers to Peer Behind Cascadia's Green Veil
22 Jan 2019 The High Lava Plains of Oregon: Volcanic and Tectonic Connection between Yellowstone and the Cascades
27 Nov 2018 Groundwater hydrology and groundwater-dependent ecosystems of central Oregon
23 Oct 2018 The Crooked River Caldera
25 Sep 2018 Assembling the Northwest: A roadside view of Oregon and Washington geology
16 Jul 2018 Oregon's volcanoes: What have we learned from global advances in volcanology over the past decade?
22 May 2018 Oblique subduction, rotating crustal blocks, and the active tectonics of the Pacific Northwest
24 Apr 2018 Mount Hood: Confessions of an interesting Boring volcano
27 Mar 2018 Geothermal Exploration at Newberry Volcano

Central Oregon Geoscience Society

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

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