**Deep time**: Author John McPhee coined this famous phrase in 1981 to help us grasp the billions of years of Earth's history
Chapter 1

The architecture of deep time

Chapter 2

Surviving the great dyings

Chapter 3

Ancient climates and changing worlds

Chapter 4

The library of 148 million secrets

YOUR GOAL

Master of Earth before us in the Smithsonian deep time vaults

Ch 1 · The architecture of deep time
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streetspirit The Smithsonian Institution keeps its massive scientific collection in restricted research vaults.

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streetspirit The Architecture of Deep Time

The planet lived before we came (oh yeah!) / Written in the bone and stone (so deep!)

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streetspirit Fossilized stromatolites represent the earliest physical evidence of life on Earth.

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Modern birds are actually living theropod dinosaurs that survived the ancient asteroid impact.

streetspirit The Archaeopteryx fossil shows a transition of feathers and skeletal features.

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Ancient cyanobacteria built rocky stromatolites that produced the oxygen we breathe today

streetspirit Dome-shaped stromatolites covered in dark microbial mats rise from a sandy seabed

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Layers of Time
BETA

streetspirit Sort fossils into rock layers to discover how Earth survived before humans existed.

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Fun Fact

Deep time: Author John McPhee coined this famous phrase in 1981 to help us grasp the billions of years of Earth's history now preserved in the Smithsonian's vaults.

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Glossary
deep time (noun)
The multimillion-year time scale of Earth's geologic history. The Smithsonian's renovated Beaux-Arts hall reopened in 2019 to display this vast geologic history.
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Gossip

If you could travel back in time, which era would you visit?

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Quiz

How old are the fossilized stromatolites from Western Australia in the Smithsonian's collection?

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streetspirit The concept of deep time measures the vast age of Earth.

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Reading the layers of the green river formation

streetspirit Fossilized lake beds from Wyoming reveal a highly detailed 50-million-year-old ecosystem.

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The 1861 discovery of Archaeopteryx in Germany connected ancient dinosaurs to modern birds.

streetspirit Feather impressions and a dinosaur-like skeleton stand out against the Bavarian limestone.

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Fun Fact

Ancient raindrops: Fossilized rain imprints from 2.7 billion years ago help scientists calculate the density of Earth's early atmosphere.

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Quiz

Where was the famous Archaeopteryx fossil, which connects dinosaurs to birds, discovered?

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streetspirit Archaeopteryx fossils show how dinosaurs evolved into modern birds.

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The fossil that rewrote avian history

streetspirit The Smithsonian's Archaeopteryx cast shows the transitional moment when dinosaurs evolved wings.

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Quiz

Who coined the term 'deep time' in 1981 to describe Earth's multi-billion-year history?

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streetspirit Scientists read the fossil layers of the Green River Formation.

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Quiz

What evolutionary group do modern birds belong to, as proven by fossils in the Smithsonian?

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