TEKS 7(C) field expedition
Deep Time
Architect
A research core contains 4.6 billion years of clues—but its timeline has collapsed. Read the rocks, date the minerals, and rebuild Earth history from oldest to youngest.
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About 12 minutes • Touch, mouse, or keyboard • Pass 4 of 5 checks for a verified badge
- 01StrataRelative order
- 02EventsCross-cutting
- 03IsotopesAbsolute age
- 04Scale4.6 billion years
- 05ModelBuild the eons
Station1 / 5
MethodSuperposition
Evidence0 / 5
CORE LABSample DTA-07
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VERIFIEDDEEP TIME
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Expedition complete
Earth history reconstructed
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Field guide
Dating Earth history
- Superposition
- In an undisturbed sequence, lower sedimentary layers are older than layers above them.
- Cross-cutting
- A fault or intrusion is younger than every rock body it cuts.
- Correlation
- Index fossils and distinctive layers connect rock sequences across locations.
- Radiometric dating
- Known isotope half-lives convert parent-to-daughter ratios into numerical ages.
- Scale
- Earth formed about 4.6 billion years ago; recent events occupy a very small part of its history.