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Andrew Alden

@geology

Geology lifer Book: Deep Oakland: How Geology Shaped a City Monthly newsletter: deeperoakland.substack.com Fortnightly blog: deepoakland.com aboutgeology on Xitr Webmaster N Calif Geol Society: norcalgeolsoc.bsky.social Personal: andrewalden.bsky.social

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Latest posts by Andrew Alden @geology

Lucky students!

12.03.2026 01:12 πŸ‘ 10 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Preview
Colombia bans all new oil and mining projects in its Amazon Colombia will no longer approve new oil or large-scale mining projects in its Amazon biome, which covers 42% of the nation’s territory, according to a Nov. 13 statement by its environment ministry. Ac...

Colombia declares its entire Amazon biome a reserve for renewable natural resourcesβ€”effectively bans any new oil exploration, hydrocarbon production, or large-scale mining.
Protected area approx 483,000 sq kmβ€”equivalent to the size of Sweden

#TropicalRainforest
#decarbonization
#envhist

10.03.2026 17:08 πŸ‘ 111 πŸ” 37 πŸ’¬ 4 πŸ“Œ 2

A writer has contacted me looking for a geologist's insight into various Bay area rock climbing sites. Not my expertise area but maybe yours? DM me.

11.03.2026 03:41 πŸ‘ 9 πŸ” 12 πŸ’¬ 1 πŸ“Œ 1
Iron sign next to Court Park, Memphis, says "Thomas Alva Edison / In 1865-66 Edison was military telegraph operator with the Federal occupation army, working in a building formerly at the east corner of North Court and November 6 Streets, and boarding next door. Trying to invent an auto-repeat key, he managed to connect New Orleans with New York directly for the first time after the war. As a result, he was discharged by a jealous superior, and he left Memphis."

Iron sign next to Court Park, Memphis, says "Thomas Alva Edison / In 1865-66 Edison was military telegraph operator with the Federal occupation army, working in a building formerly at the east corner of North Court and November 6 Streets, and boarding next door. Trying to invent an auto-repeat key, he managed to connect New Orleans with New York directly for the first time after the war. As a result, he was discharged by a jealous superior, and he left Memphis."

TIL something else about Memphis.

11.03.2026 03:22 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

GSA Triple Section Meeting attendees, vote in the geology-club t-shirt contest and remember what Chuck Berry said: Don't forget Winona!

10.03.2026 17:52 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Time to pass a law that any party spokesperson of media outlet that opines with hindsight reckons on pandemic management has to show this chart in the background at all times #nzpol

10.03.2026 02:49 πŸ‘ 335 πŸ” 157 πŸ’¬ 5 πŸ“Œ 7

Thank you "Cali" Bentley

09.03.2026 23:43 πŸ‘ 11 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
Picture of a possible diogenite: a piece of broken rock, very dark from the inside, light grey from the outside.

Picture of a possible diogenite: a piece of broken rock, very dark from the inside, light grey from the outside.

Eerste goede foto van de meteoriet van gisteren:
First good picture of yesterday's meteorite (found in Koblenz):

09.03.2026 13:40 πŸ‘ 45 πŸ” 6 πŸ’¬ 1 πŸ“Œ 1

I should call it the object, not the meteorite.

09.03.2026 13:08 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

The paper looks correctly brown, so this meteorite must actually be blue-green.

09.03.2026 03:40 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Clockwise, from top left: Jupiter, Saturn, Neptune, and Uranus. None of the worlds is to scale, but all are imaged with JWST's near-infrared (NIRCam) instrument.

Clockwise, from top left: Jupiter, Saturn, Neptune, and Uranus. None of the worlds is to scale, but all are imaged with JWST's near-infrared (NIRCam) instrument.

The giant planets of the Solar System, by JWST.

09.03.2026 02:46 πŸ‘ 546 πŸ” 164 πŸ’¬ 7 πŸ“Œ 12

I know just the spot

08.03.2026 22:28 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

You are at a graywacke outcrop.

08.03.2026 02:56 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Gore Cyn west of Kremmling CO

06.03.2026 15:24 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Whitewater river flows toward viewer in steep rocky canyon w/jagged walls, railroad with tunnels on right bank

Whitewater river flows toward viewer in steep rocky canyon w/jagged walls, railroad with tunnels on right bank

Upper Colorado River yesterday

06.03.2026 14:23 πŸ‘ 14 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Memphis, then Houston

06.03.2026 02:45 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

achievement unlocked!

05.03.2026 16:44 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Roan Cliffs in eastern Utah seen from the California Zephyr

Roan Cliffs in eastern Utah seen from the California Zephyr

Utah this morning

05.03.2026 16:40 πŸ‘ 13 πŸ” 0 πŸ’¬ 3 πŸ“Œ 0

There's always some little thing.

02.03.2026 23:34 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Ocher quarry update The former campus of Holy Names University, in the hills just above the Warren Freeway, has been for sale for a while, but no one seems to want to move an existing college or start a new one there.…

New blog post!

02.03.2026 18:36 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Dark orange-red siliceous ocher, Oakland Hills, with various light blue-green lichens

Dark orange-red siliceous ocher, Oakland Hills, with various light blue-green lichens

New blog post coming maΓ±ana

01.03.2026 19:55 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

But dams and stills are mas macho

01.03.2026 19:49 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

HB2U!

01.03.2026 19:36 πŸ‘ 5 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

πŸ§ͺ🏺 Update - authors have new paper showing how useless gen- #AI is for archaeological illustration.
All 400 images were multiply inaccurate (physically, socially, technologically, environmentally), even with improved prompts.

JUST USE HUMAN EXPERTS & ARTISTS

www.cambridge.org/core/journal...

13.02.2026 18:09 πŸ‘ 643 πŸ” 250 πŸ’¬ 28 πŸ“Œ 33

It's a weird day. Today marks the one-year anniversary of my illegal firing from NOAA. And what a year it has been.

In the last year, I've seen pretty much my entire 15 year NOAA career attacked.

Bye Climate Prediction Center
Bye Climate.gov
Bye State Deptartment climate work

1/3

27.02.2026 21:59 πŸ‘ 68 πŸ” 13 πŸ’¬ 1 πŸ“Œ 0
Chunk of ocherous colluvium, red-orange, on bland duff

Chunk of ocherous colluvium, red-orange, on bland duff

chunk of reddish precursor rock next to a concrete step with "10-80/SWS/Simon" hand-inscribed on it

chunk of reddish precursor rock next to a concrete step with "10-80/SWS/Simon" hand-inscribed on it

How to date the old Ohlone ocher quarry? . . . Aha, an absolute age clue!

27.02.2026 21:31 πŸ‘ 7 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

For some reason(s) Male nean. X Female sap. seems to have predominated, then all nean. genes were suppressed in sap. across the board.

27.02.2026 02:54 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

"All the women in my workplace are nervous. Must be the female brain."

24.02.2026 06:50 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Looks like a Bruce Beasley lamp.

24.02.2026 06:46 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

We'll be unmaking bad coastal decisions the rest of our lives.

24.02.2026 06:43 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0