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Northern California Geological Society

@norcalgeolsoc.bsky.social
225 followers 19 following 76 posts

We meet monthly in Orinda. We sponsor field trips. We award $2000 grants to grad students every year. Founded in 1944. Dues $25/yr cheap comes with e-newsletter. New blood welcome. ncgeolsoc.org (account run by @geology)

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Northern California Geological Society @norcalgeolsoc.bsky.social · 07/10/2026
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Northern California Geological Society @norcalgeolsoc.bsky.social · 03/10/2026
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Northern California Geological Society @norcalgeolsoc.bsky.social · 26/09/2026
Congratulations to Dr. Dawn Sumner, a new AGU Fellow! She was our speaker in September 2000 and had a full-page summary in the October newsletter, preserved on our website. ncgeolsoc.org/past-meeting...
ncgeolsoc.org
Past Meetings 2000–01 to 2009–10
Past Meetings, 2000–01 to 2009–10 Click the talk title to see the talk abstract and speaker’s biography (PDF). June 28, 2000Keil Albert, Geoconsultants Inc. ― Provenance of the Irvington Grav…
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Alessandro Chiarenza @macroecoevoale.bsky.social · 16/09/2026
How do you take the temperature of a T. rex 66 million years too late? Time machine? Impossible. Billionaire’s dinosaur island? Risky. Geochemistry? Much safer 🦖🌡️ Our new Science Advances paper adds evidence for an endothermic, “warm-blooded” T. rex, link to the paper 🔗 doi.org/10.1126/scia...
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David Grinspoon @drfunkyspoon.bsky.social · 31/08/2026
I’m doing 2 presentations at Exploratorium in San Fran Thurs 9/3 part of "After Dark: Pale Blue Dot" 7:30 PM “OUR PLANETARY FUTURE: How can we go from just changing Earth to caring for it?" 8:15 "Ask an Astrobiologist Anything" discussion. Hope to see you! www.exploratorium.edu/visit/calend...
exploratorium.edu
After Dark: Pale Blue Dot | Exploratorium Museum Event
Take a step way back and see our planet in context: a tiny yet dynamic system in a vast cosmic neighborhood.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 26/08/2026
Mt. Diablo Interpretive Association hosts a talk Wednesday 8/26 on the geology of the Mount Diablo area.
mdia.org
Plate Tectonic Evolution of Mount Diablo | mdia
Webinar - Registration Required
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Brad Johnson @climatebrad.hillheat.com · 25/08/2026
The Trump Department of Interior is forcing out dozens of its most senior career staff, giving them two weeks to accept involuntary reassignments or leave. Fish and Wildlife Service, U.S. Geological Survey, Bureau of Land Management, and more. www.notus.org/agencies/int...
notus.org
‘They Want Us All To Leave’: Interior Reassigns Dozens of Senior Staff
Around 30 top staffers have been reshuffled, with some people moving to teams outside their areas of expertise.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 24/08/2026
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Alexandra Witze @alexwitze.bsky.social · 20/08/2026
Do you want to write a story about volcanoes that changed history? the editor asked. Why yes. Yes, I do. My piece in @knowablemag.bsky.social on the terrible, horrible, no good, very bad days that can transpire after an eruption: knowablemagazine.org/content/arti... 🧪🌋
knowablemagazine.org
Volcanoes that made history
Long after the lava stopped flowing, enormous eruptions altered Earth’s climate and societies all over the globe
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Andrew Alden @geology.bsky.social · 17/08/2026
The most amazing cave formations I've seen since the Naica giant gypsum spears.
pubs.geoscienceworld.org
Cave speleogenesis constrains landscape evolution and drainage integration in southern Nevada since 1.6 Ma | Geosphere | GeoScienceWorld
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Henning @geohenning.bsky.social · 13/08/2026
A new video emerged which seems to show a surface rupture in Yatsushiro, Japan following the M6.8 earthquake in July! Exact location of the video would be 32°30'04.0"N 130°38'29.9"E. Absolutely wild. Only the second ever video of a surface rupture forming after the 2025 Myanmar video! ⚒️🧪 #geology
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Garry Hayes @geotripper.bsky.social · 24/07/2026
Day 14 of our PNW field studies found us driving home across northern Nevada. We stopped for the night at at Angel Creek and Lake in the Eastern Humboldt Range. This Range was considered for national park status in the 1990s. The rocks are part of an ancient metamorphic core complex.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 22/07/2026
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Northern California Geological Society @norcalgeolsoc.bsky.social · 10/07/2026
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Northern California Geological Society @norcalgeolsoc.bsky.social · 08/07/2026
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Randall Munroe @xkcd.com · 03/07/2026
Holes xkcd.com/3266/
Comic: Holes. Elevation is to scale relative to sea level and ground level. Land shapes and horizontal distances are not to scale. [Lines for every 1k meters starting from -12k up to +4k: Bingham Canyon Mine (US), Veryovkina Cave (Georgia), MPONENG Gold Mine (South Africa), Sanford Laboratory (US), Giant Crystal Cave (Mexico), Derinkugo Underground City (Turkey), WIPP (US), Restof Salt Mine, with an arrow pointing at the bottom that reads “oops” (US), San Andreas Fault Observatory Borehole (US) CFB North Bay (Canada), Woodingdean Water Well (dug by hand) (United Kingdom), Diefen-Bunker (Canada), Deep Underground Command Center (Canceled in 1965) (US), Lake Peigneu, with another oops arrow next to it (US), Sydney Opera House Parking (Australia), Onkalo Spent Nuclear Fuel Repository (Finland), Hudson River, Delaware Aqueduct (US), Raven Rock (US), Wieliczka and Bochina Salt Mines (Poland), Atchison Storage Facility (US), Snolab (Canada), Detroit Salt Mine (US), Hongyancun Subway Station (China), Nuclear Test Shafts (North Korea), Super Kamiokande Neutrino Detector (Japan), Gran Sasso Laboratory (Italy), Peak above Gran Sasso, Modane Laboratory (France), Peak above Modane Laboratory, Gotthard Tunnel (Switzerland), Peak above Cheyenne Bunker and Gotthard Tunnel, Cheyenne Mountain Bunker (US), Kola Superdeep Borehole (Russia) - deepest artificial point below surface at -11917m, Lake Baikal (Russia), sediments under Lake Baikal, IDDP-2 Borehole (Iceland), Dead Sea (multiple countries), Ryfylke Tunnel (Norway), Pantal Remis Mine with another oops arrow (Malaysia), Great Blue Hole (Belize), Joides Resolution Expedition 307 (Atlantic Ocean), Deepwater Horizon Borehole (Gulf of Mexico) - deepest artificial point below sea level at -11944m, Glomar Challenger Hole 504B (Pacific Ocean), Mohole (Pacific Ocean), Joides Resolution Expedition 329 (Pacific Ocean), Mariana Trench (Pacific Ocean)]
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Northern California Geological Society @norcalgeolsoc.bsky.social · 29/06/2026
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Northern California Geological Society @norcalgeolsoc.bsky.social · 25/06/2026
earthquakeinsights.substack.com/p/catastroph...
earthquakeinsights.substack.com
Catastrophic M7.5 earthquake strikes northern Venezuela
Severe damage; collapsed buildings; significant fatalities possible
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Northern California Geological Society @norcalgeolsoc.bsky.social · 12/06/2026
From our webmaster
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Northern California Geological Society @norcalgeolsoc.bsky.social · 05/06/2026
Our Scholarship Chair Phillip Garbutt is stepping down after 21 years. To mark the occasion NCGS members have made/pledged contributions to our scholarship fund totaling more than $2,000. Donations through August will add to the total; use our event registration page at ncgs.regfox.com/ncgs-landing
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Northern California Geological Society @norcalgeolsoc.bsky.social · 30/05/2026
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Northern California Geological Society @norcalgeolsoc.bsky.social · 30/05/2026
A personal post from yer 'umble webmaster.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 17/05/2026
Our June meeting is NCGS Members Night! Tom MacKinnon: Dimensions of Underplated Slices in Ancient Accretionary Complexes in NZ & Calif Don Medwedeff: East Bay Growth Structures: How Best to Analyze Them? Wayne Narr: Depositional & Lithological Control on Fractures in a Steep Reefal Carbonate Margin
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Northern California Geological Society @norcalgeolsoc.bsky.social · 16/05/2026
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Prof Col Macpherson @colinmacpherson.bsky.social · 14/05/2026
For geologists ⚒️🧪; silver screen 🤝 concrete boots
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Northern California Geological Society @norcalgeolsoc.bsky.social · 02/05/2026
Register for our annual May dinner meeting, May 27, featuring Dr. Peter Roopnarine's talk, "Everything changes, but remains the same: Persistent and repeating ecosystems in Earth's history"
ncgs.regfox.com
NCGS Dinner Meeting May 2026
Get tickets online for NCGS Dinner Meeting May 2026 here.
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California Geological Survey @cageosurvey.bsky.social · 30/04/2026
NEW RELEASE! Sierra Nevada Earth Science Atlas The Sierra Nevada Earth Science Atlas provides the most detailed geologic framework mapping of the Sierra Nevada that has ever been made. www.conservation.ca.gov/cgs/sierra-n...
Geologic map of the Sierra Nevada mountains and surrounding area. The map shows hundreds of different geologic formations, indicated by different colors and patterns on the map.
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Dr. Wendy Bohon @drwendyrocks.bsky.social · 17/04/2026
Fault creep on the Maacama fault, with @timblor.bsky.social
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Northern California Geological Society @norcalgeolsoc.bsky.social · 12/04/2026
Our April meeting features James Faulds, Nevada Bureau of Mines, speaking on Nevada's great geothermal endowment and how geology put it there: April 29.
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Tim Dawson @timblor.bsky.social · 11/04/2026
Gift article about vertical evacuation structures in the PacNW: These Towns Want a Tsunami Shelter Before It’s Too Late www.nytimes.com/2026/04/11/r...
nytimes.com
These Towns Want a Tsunami Shelter Before It’s Too Late
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Liz Hearn @liz-hearn.bsky.social · 10/04/2026
Are you in southern California or Baja? Let the USGS know if you felt the sonic boom from the Artemis re-entry! DYFI link: earthquake.usgs.gov/earthquakes/...
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Tim Dawson @timblor.bsky.social · 04/04/2026
Found out that George Plafker, USGS earthquake geologist known for his work after the 1964 Alaska earthquake passed away yesterday at 97. I was able to spend a few days in the field with him after the 2002 Denali EQ, as well as seeing him often at the USGS in Menlo Park. Full of amazing stories.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 04/04/2026
Our 2025-26 scholarship recipient, Nancy Carman, presented last month at the Lunar and Planetary Science Conference on her comparison of Lassen Volcano fumaroles and Gusev crater, Mars. www.hou.usra.edu/meetings/lps...
schematic illustrations of fumarolic soils at Lassen after wet (left) and dry (middle) seasons and "Paso Robles" class soils on Mars (right) showing various sulfate crusts and mineral segregations
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Northern California Geological Society @norcalgeolsoc.bsky.social · 04/04/2026
Abstract for our April meeting talk by James Faulds of Nevada Bureau and Mines and Geology: ncgeolsoc.org/wp-content/u...
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Northern California Geological Society @norcalgeolsoc.bsky.social · 28/03/2026
Our field trip guide to the summit and western flank of Mount Diablo is now publically available. Find the PDF in our Past Field Trips table.
ncgeolsoc.org
Past Field Trips
Past NCGS Field Trips This table lists the field trips we have conducted since our founding in 1944. Particularly during 2003–2006, NCGS members created reports of these outings for posting online.…
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Cin-Ty Lee @cintylee.bsky.social · 27/03/2026
arclogite sample from the Sierra Nevada, California. These are deep arc cumulates. I got started on these rocks when I was an undergrad... they have taken me down many many paths. But above all, they are just pretty to look at.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 22/03/2026
Steve is an NCGS member.
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The One True Kat @theonetruekat.bsky.social · 13/03/2026
Friendly reminder that the spicy noodles are not your enemy and deserve your protection. This little man was next to our check-in point, so he was moved just a little further away, into protective cover. Northern Pacific Rattlesnake. #herps
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Anne Jefferson @annejefferson.bsky.social · 10/03/2026
Tonight, I was looking at water.noaa.gov to see where the US is flooding. My 11-year old pointed to the ongoing major flooding in North Dakota, and I said "Oh, that's Devils Lake. It's always flooding there." They asked "Why?" and a rabbit hole yawned before me.
water.noaa.gov
National Water Prediction Service - NOAA
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Kristian Svennevig @ksvenenvig.bsky.social · 03/03/2026
Tsunamigenic rockslide on your desktop? This is a scaled and simplified model of the 2017 Karrat landslide. I think it captures the dynamics of the tsunami generation quite well, though it is of course, very simplified.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 22/02/2026
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British Geological Survey @bgs.ac.uk · 19/02/2026
The identification of a 'smiling' object found on Holy Island in Northumberland has been confirmed by BGS senior paleontologist Jan Hennissen. www.bbc.co.uk/news/article...
bbc.co.uk
'Smiling' fossil discovered in Northumberland
The unusual looking fossil is estimated to be a few hundred million years old dating to the Carboniferous period.
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Northern California Geological Society @norcalgeolsoc.bsky.social · 20/02/2026
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Northern California Geological Society @norcalgeolsoc.bsky.social · 20/02/2026
You seen this fossil being memeified?
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Northern California Geological Society @norcalgeolsoc.bsky.social · 19/02/2026
NCGS has awarded $2000 scholarships: Nancy Carman (U Wisc Milwaukee), "Redox-driven mineral evolution in Lassen’s hydrothermal system: Seasonal controls on active surface alteration" Gwyneth Chilcoat (UC Davis), "Reconstructing shellfish communities of the Holocene San Francisco Bay" Congrats!
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Northern California Geological Society @norcalgeolsoc.bsky.social · 19/02/2026
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Garry Hayes @geotripper.bsky.social · 17/02/2026
The view of Death Valley from Dante's view is spectacular. Lake Manly is clearly drying up but it may get a little push from the storms coming through this week. #deathvalley
Snowy mountains looming over Salt flats and ephemeral Lake ManlySalt flats and ephemeral lake in deep fault valley
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CAL FIRE @calfire.bsky.social · 07/02/2026
🏈 Wildfire plays offense. Your home needs defense. Firewood stacked against the house, leaves in the gutters, and flammable fences create gaps in your defense. Defensible space closes those gaps by separating fuels and stopping embers before they reach your home. #SuperBowl #GameDay #Championship
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Northern California Geological Society @norcalgeolsoc.bsky.social · 02/02/2026
From our webmaster: oaklandgeology.com/2026/02/02/t...
oaklandgeology.com
The story of blue rock
There was a long period in Oakland’s history when the city cared deeply about its streets and took great pains with the rock it used in them. The tiny village that became Oakland in 1852 was …
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