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📘 Geological cross-sections

Cut straight down. Read the face.

1
lesson
~10 min
to learn
Adults
level
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What you’ll learn

  1. Read the sliceOrder beds, intrusions, faults, and unconformities on a geological cross-section.Use superposition and cross-cutting rules to build an event sequence before assigning numerical ages.

Questions this course answers

A fault cuts a layer. Which is younger?

The cutting feature is younger than what it cuts.

What does superposition provide?

Superposition orders undisturbed layers.

An intrusion cuts three beds. What can you conclude?

Cross-cutting relationships make the cutter younger.

What does an unconformity represent?

Unconformities mark gaps in the rock record.

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