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Sequencing of Rocks: What Was the Order of Events?
These activities illustrate the order of rocks in a sequence and tells us about the relative timing of their formation. Students use layers of colored sand and colored paper to simulate the sequencing involved in the formation of rock layers. At the end of the activities students should understand that rocks lower in a sequence are usually older than ones that are higher up (superposition). They should also understand that a rock that cuts through another is younger than the one it cuts through (cross-cutting relationships).
Intended for grade levels:
  • Middle (6-8)
Type of resource:
  • For the classroom:
    • Lab activity
  • Geological Sciences:
    • Geology
Technical requirements:
No specific technical requirements, just a browser required
Cost / Copyright:
No cost
Copyright is waived for original material published on this site if the material is required for use within the laboratory or classroom. The copyright of material reproduced by permission of other publishers rests with the originating publisher.
DLESE Catalog ID: DLESE-000-000-006-592
Educational standards:
  • National Science Education Standards (NSES):
    • K-4:
      • Unifying concepts and processes:
        • Evidence, models, and explanation
      • A - Science as inquiry:
        • Abilities necessary to do scientific inquiry
      • D - Earth and space science:
        • Properties of earth materials
Resource contact / Creator / Publisher:
Publisher: Joint Earth Science Education Initiative (JESEI)