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📘 Relative dating

Older or younger — not how many years.

1
lesson
~10 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Order the rocksApply superposition, horizontality, cross-cutting, inclusions, and unconformities to order geologic events.Build an oldest-to-youngest event list before interpreting numerical ages or fossil correlations.

Questions this course answers

What does relative dating provide?

It establishes older-younger relationships.

Which principle fits undisturbed flat layers?

Lower beds are older in an undisturbed stack.

A dike cuts sandstone. Which is younger?

Cross-cutting features are younger than what they cut.

Grounded in trusted sources

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