The Geological Society of America (GSA)

There’s still time to step into a leadership role in geoscience publishing! GSA is seeking science editors, associate editors & editorial board members to help guide the next wave of research. Build experience, expand your network, and shape your field.

Explore openings: geosociety.co/GSAEditors

The December issue of GSA Today is full of innovative ideas in the geosciences!

• Learn about how NASA's SWOT satellite is revolutionizing fluvial geomorphology.
• Tag along on a college hydrogeology field course.
• And so much more! 🌎

Read the newest issue here: geosociety.co/GSATDec25

#GSAToday

EarthCache Spotlight: Lake Sammamish Sunken Forest, Washington, United States

A prehistoric quake sent an entire forest sliding into the lake ~1,000 years ago—where cold, low-oxygen water preserved the massive trunks still visible today.

Explore more EarthCaches: geosociety.co/EarthCache

Interested in the Driftless Area? “Physical Geography and Geology of #DriftlessArea: Career & Contributions of James C. Knox” (ed. by E.C. Carson et al.) explores Pleistocene vegetation, Holocene #paleofloods, prehistory, #floodplain systems, & mining.

Get your PDF today: geosociety.co/3LVxEHS

New #Geosphere study shows Utah’s east Traverse Mountains aren’t fault-bounded—they’re a 75–150 km³ mega-landslide that slid 16 km from the Little Cottonwood stock ~6 Ma!

🔗 Read more: geosociety.co/4oK1QUW
#GSAPubs #UtahGeology #WasatchFront #StructuralGeology #Geoscience

📆 Got plans for 2026? You do now. Early Registration for the 2026 Section Meetings is open! Dive into regional science, connect with your community, and add short courses to level up your skills.

🚨 Students, travel aid is available—apply before early reg closes: geosociety.co/SectionMeetings

How does stress shape frac efficiency in CBM wells? New #GSABulletin research from China’s Qinshui Basin shows fracture pressure hinges on vertical–horizontal stress balance, and seams with lower horizontal stress or tensile strength fracture more easily.
Read the full article: geosociety.co/47ZdTqn

How did fluorine drive gold-tellurium remobilization in a VMS system? New #GSABulletin research reveals Late Triassic overprinting of Silurian deposits in SW China—offering fresh clues for mineral exploration.

Read more: geosociety.co/44d8URA
#EconomicGeology #Geochemistry #MineralResources

How long does it take to form critical minerals in huge igneous systems? A new #Geosphere study on Colorado’s Pikes Peak batholith uses high-precision ID-TIMS ages to show that Nb-rich deposits develop over multimillion-year magmatic histories.

Read the full article: geosociety.co/43r60IQ

New in #GSABulletin! Early to middle Eocene (50–43 Ma) Xianqian Basin in central Tibet: Archives of arid paleoenvironments and a southward plateau uplift trend.

Read the article here: geosociety.co/47YPH7y
#Geology #Paleogeography #Tectonics
Image: Base photograph for Figure 4C from the paper.

Could some carbonate ooids have formed through abiotic chemically oscillating reactions—not just biological processes? A new study by Papineau et al. challenges long-held assumptions about ooid formation & biosignatures.

Read the article: geosociety.co/446Q6DB
Image: Figure 13C from the paper.

Dinosaurian extinction—asteroid impact or volcanic activity? New research in #GSABulletin concludes that volcanism and resulting environmental degradation was the primary cause.

Read the full article: geosociety.co/4r1VG41
#Volcanology #Chicxulub #ImpactCrater
Image: Figure 4 from the paper.

The GSA Holiday Gift Guide is here! 🎁 From maps and field guides to kids’ books and geo-swag, there’s something for every rock fan.

✨ 20% OFF with code: HOLIDAY20 through 1 December
📦 Order by 12 December for delivery before the 24th

Browse the Holiday Gift Guide: geosociety.co/Holiday20

Ethiopia’s Hayli Gubbi volcano just erupted for the first time in ~12,000 years—a reminder of how active the East African Rift really is. New Geosphere research shows how volcanism from Madagascar to the Comoros fits into a long east-to-west tectonic story shaping the region.
🔗 geosociety.co/4p5evSD

Looking for the right fit for your research? #Geosphere is great for layered figures. See open themed issues on earthquakes & on the Basin and Range: geosociety.co/4mv9wZH

Submit manuscript: geosociety.co/4oF6SCH
Read the latest issue of Geosphere: geosociety.co/4p61CHq
#Geoscience #Geology

How can a few zircon grains reshape a tectonic timeline? A new study tests MDAs using LA-ICP-MS and CA-ID-TIMS, revealing that deformation during the Late Jurassic Nevadan orogeny lasted longer than thought.

Read the full article: geosociety.co/3X0qXGO
Image: Figure 13 from the paper.

Arabian Peninsula volcanism in Alohali et al.’s “Refined chronology of late Quaternary eruptions, Harrat Khaybar, Saudi Arabia, with implications for magma dynamics & regional volcanic history”.

Full article here: geosociety.co/4hWW7bA
Image: Figure 3 from the paper.
Oregon State University CEOAS

Rethinking point-bar architecture: Insights from the meandering Powder River (Montana, USA)—Read the new study in #GSABulletin: geosociety.co/4nUzJBa

#FluvialGeomorphology #Sedimentology #Rivers #PowderRiver
Photo by USFWS

NEW books available now! 📚

Get the new editions of "Geysers: What They Are and How They Work" and "Roadside Geology of Texas" now at: geosociety.co/store

Everyone needs a new geology book for the holidays! 🎁

#Geology #EarthScience #Geysers #TexasGeology

EarthCache Spotlight: New Castle of Manzanares el Real, Madrid!
A medieval fortress in La Pedriza with stunning architecture and rich geology.

📍 Madrid, Spain
📊 Difficulty: 1.5/5 | Terrain: 1.5/5
🔗 Explore more: geosociety.co/earthcache
#Geology #Spain #EarthCache

The GSA #2026Calendar, Timeless Terrain, showcases images of hoodoos, Percé Rock, & Erg Chebbi sand dunes. This go-to guide for dates keeps you engaged with events & programs that shape our science and our future.

Buy the 2026 calendar here: geosociety.co/43uOa7E
#Calendar #GeologyRocks #Geoscience

The Nov/Dec issue of #GSABulletin is now online! Explore new research across the geosciences and check out this month’s stunning cover featuring a large microbial buildup in the Upper Cambrian Wilberns Formation.

Read the full issue: geosociety.co/4ewtd0c
#GSAPubs #Geology #Geoscience #EarthScience

New #Geosphere research delivers the first systematic look at paleoearthquake timing along the Western Nepal fault system. All studied faults ruptured in the Holocene—pointing to complex multifault events and added seismic hazards in the Himalaya.

Read the full article: geosociety.co/47EIZ7G

The November issue of #Geology is now online. Topics include "Evolution of skeletal mineralogy in cheilostome bryozoans from calcite to aragonite seas" and "Unique leaf mimicry in Jurassic insects."

Read more at geosociety.co/3M2YZaY
#Jurassic #Mineralogy #GSAPubs

How did methane cycling respond to extreme warming ~56 Ma?

A new #Geology study finds salinity in a Paleocene–Eocene lake limited methane production, potentially buffering greenhouse gas feedbacks. Important insight as inland waters worldwide become more saline.

Read more: geosociety.co/4o2qMWx

EarthCache Spotlight: Newnan’s Lake, Florida 🌿

A shallow, clay-bottom basin shaped by time, hydrology & geology. Its wetlands slow drainage, water levels swing widely, and drought once revealed 100+ ancient canoes.

Explore more EarthCaches: geosociety.co/earthcache
#EarthCache #Geology

Ever wondered how giant blobs of magma (plutons) get stuck in Earth’s crust?

In the new episode of Geology Bites, Geologist Keith Klepeis discusses his exciting work studying ancient magma pathways, dikes and sills, that once carried molten rock upward.

🎧 Listen now: geosociety.co/magma

Ever wonder how GPS can pinpoint your location so accurately?

In a recent episode of Geology Bites, MIT’s Tom Herring discusses exciting new developments in high-precision geodesy.

Listen now: geosociety.co/43GicoX

#Geodesy #GPS #GeosciencePodcast #GeologtBites

Discover how planetary scientists and astronauts learn from Earth itself in “Analogs for Planetary Exploration” (edited by W. Brent Garry & Jacob E. Bleacher).

Buy a PDF of the book today: geosociety.co/4i11R4l
#PlanetaryScience #Astronaut #FieldTrips #Moon #Mars

GSA was proud to support the 7th Annual Fería de las Ciencias de la Tierra y el Espacio in Puerto Vallarta! Students explored earthquakes, volcanoes, tides, hurricanes & more—guided by members of the scientific community.

Learn more: raugm.org.mx/feria
#PuertoVallarta2025 #CienciaParaTodos