The Field Atlas

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Grand Prismatic Spring from above
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Fig. 1Grand Prismatic Spring from above

Landform

A living supervolcano plateau. Geysers, hot springs, travertine terraces, and a high lodgepole forest over rhyolite.

Field note

Grand Prismatic is a hot spring ringed in thermophile color. Castle and Old Faithful speak from the Upper Geyser Basin. This is the largest intact temperate ecosystem in the lower 48.

Views & peaks

Inside this plate

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Stamp each view as you reach it; the plate seals when every one is inked.

A private leaf

Prints from Yellowstone

Instant paper, this copy only. Write on the white — a line the walk still owes you.

The prints

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Opening the leaf…

Onward

A day's country

The nearest plates, by the miles.

Volcanic chapter

More volcanic destinations

Other US volcanic plates. See all volcanic destinations in the USA

Fold-out

On the chart

Vintage map of the United States