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Acid Trip – Norris Geyser Basin

Katherine Hanson by Katherine Hanson
Acid Trip – Norris Geyser Basin

It’s not easy to describe the wonder that is Norris Geyser Basin, and so I won’t even try. Words simply cannot do it justice. However, here are some photos and facts about this astonishing place.

IMG_3622PorcelainBasin
Porcelain Basin in Norris Geyser Basin

Norris is situated just outside the boundary of the third Yellowstone Caldera (640,000 years old) but is within the first and largest caldera which occurred 2.1 million years ago. Its location at the junction of three major faults makes this one of the most active earthquake areas of Yellowstone.

IMG_3610 LambchopGeyser
“Lambchop geyser” in the Porcelain Basin

It is one of the hottest and most dynamic hydrothermal areas in the Park. Many of its hot springs and fumaroles (steam vents) have temperatures above the boiling point of water which at this elevation is around 200°F.

IMG_3646Black GrowlerSteamVent
Black Growler steam vent

Norris is also home to Echinus Geyser, the largest acidic geyser in the world. With an average pH of 3–4 its waters are almost as acidic as vinegar.

Echinus Geyser

Echinus comes from the Greek word for spiny, the same root name (echinoderm) given to starfish and sea urchins. There is a resemblance, too, in the coating of spiny sinter deposits typical of these acid water conditions.


The stunning reds and yellows in the waters of Echinus Geyser are caused by iron oxide minerals being deposited along with the sinter. Arsenic compounds are also deposited by the hot water at Echinus.

IMG_3727RunoffAtEchinusGeyser
Run-off at Echinus Geyser

Microscopic, heat–loving organisms called thermophiles not only survive but thrive in these acidic waters of Norris Geyser Basin.

IMG_3729RunoffAtEchinusGeyser

Katherine Hanson

Katherine Hanson

Hey there, I'm Katherine Hanson, the curator of watchingforrocks.com, a site dedicated to uncovering the hidden gems of the USA. With a passion for exploration and a love for discovering the beauty in every corner of this vast country, I'm on a mission to share the best cities, national parks, historic landmarks, and entertainment hotspots that the USA has to offer. From towering mountains to bustling cities, there's so much to see and experience. Join me as I embark on adventures and uncover the wonders that make America truly remarkable.
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