Andrew Alden
@geology.bsky.social
Geology lifer
Author Deep Oakland: How Geology Shaped a City (Heyday)
Substack "Deeper Oakland"
Blogger at deepoakland.com
aboutgeology on Xitr for now
Webmaster, N. Calif. Geol. Society: norcalgeolsoc.bsky.social
Personal: andrewalden.bsky.social
Author Deep Oakland: How Geology Shaped a City (Heyday)
Substack "Deeper Oakland"
Blogger at deepoakland.com
aboutgeology on Xitr for now
Webmaster, N. Calif. Geol. Society: norcalgeolsoc.bsky.social
Personal: andrewalden.bsky.social
Dusted my pet rocks today. I'll put this one back some day, but not soon.
November 5, 2025 at 12:23 AM
Dusted my pet rocks today. I'll put this one back some day, but not soon.
A giant Miocene landslide in the Wasatch Range, Utah - Geosphere paper. pubs.geoscienceworld.org/gsa/geospher...
October 31, 2025 at 8:52 PM
A giant Miocene landslide in the Wasatch Range, Utah - Geosphere paper. pubs.geoscienceworld.org/gsa/geospher...
White Mountains are white
October 23, 2025 at 11:45 PM
White Mountains are white
Valle Guadalupe, BC
October 16, 2025 at 7:04 PM
Valle Guadalupe, BC
I look at my iron meteorite every now and then and try to picture the force it took to rip this piece apart.
October 8, 2025 at 3:58 AM
I look at my iron meteorite every now and then and try to picture the force it took to rip this piece apart.
Haha, mammon calls.
October 3, 2025 at 6:34 PM
Haha, mammon calls.
What is this building cladding called?
September 30, 2025 at 11:39 PM
What is this building cladding called?
New blog post drops tomorrow
September 28, 2025 at 6:06 PM
New blog post drops tomorrow
Colorful day in Oakland's bonsai garden
September 21, 2025 at 11:10 PM
Colorful day in Oakland's bonsai garden
Enigmatic rocks in Joaquin Miller Park
September 18, 2025 at 11:13 PM
Enigmatic rocks in Joaquin Miller Park
getting ready to start
September 17, 2025 at 11:07 PM
getting ready to start
I want to return to that part of Alaska too. Image taken late summer 1979.
September 16, 2025 at 11:56 PM
I want to return to that part of Alaska too. Image taken late summer 1979.
New blog post on the geology to be seen and visited on out newest bus line, the 31. oaklandgeology.com/2025/09/15/g...
September 15, 2025 at 9:46 PM
New blog post on the geology to be seen and visited on out newest bus line, the 31. oaklandgeology.com/2025/09/15/g...
New blog post drops on Monday morning
September 12, 2025 at 5:12 PM
New blog post drops on Monday morning
RT with the rocks you use for your desktop screen (with alt tag).
September 10, 2025 at 6:46 PM
RT with the rocks you use for your desktop screen (with alt tag).
Google Earth has historical imagery; this is from May 2018.
September 4, 2025 at 6:07 PM
Google Earth has historical imagery; this is from May 2018.
The annual #mineralcup contest is underway here on Bluesky. I don't think this mineral is part of it this time, but admire it anyway.
September 2, 2025 at 6:22 PM
The annual #mineralcup contest is underway here on Bluesky. I don't think this mineral is part of it this time, but admire it anyway.
New blog post tomorrow
September 1, 2025 at 4:05 AM
New blog post tomorrow
New Substack going out tomorrow
August 30, 2025 at 3:35 AM
New Substack going out tomorrow
July 30, 2025 at 2:04 AM
New in Science Advances (open access): Boggling fossils in a Grand Canyon lagerstatt preserve the throat-teeth of Middle Cambrian (explosion-era) priapulid worms in a rich ecological setting. Scale bar 60 µm. www.science.org/doi/10.1126/...
July 23, 2025 at 11:25 PM
New in Science Advances (open access): Boggling fossils in a Grand Canyon lagerstatt preserve the throat-teeth of Middle Cambrian (explosion-era) priapulid worms in a rich ecological setting. Scale bar 60 µm. www.science.org/doi/10.1126/...
