Fossil Rocks

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In this activity, learners will discover how fossils are dug out of the earth by carefully exposing treasures hidden in an artificial rock that is easily made at home. They will make their own fossil rock (or it can be made ahead of time by an adult), and use simple tools to find the "fossils" inside. The activity includes a time and age recommendation, a materials list, step-by-step set up instructions, tips for adults, learning and skills connections, a "what's going on" section, and a note about doing STEAM with kids. This activity requires an oven to make the rocks.

Quick Guide

Preparation Time:
4 to 24 hours

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
$1 - $5 per student

Age Range:
Ages 6 - adult

Resource Type:


Materials List (per student)

  • 2 cups of flour
  • 1 cup of salt
  • 1 cup ground coffee
  • 1 cup salt
  • A mixer OR large bowl and mixing spoon
  • A baking sheet
  • Small toys or treasures to hide inside the rocks; OR buy actual fossils here
  • Paintbrushes
  • A small screwdriver
  • A light hammer or mallet
  • A small bowl of water


  • Engineering and Technology
    • Technology
  • The Nature of Science
    • Science as a Career

Informal Categories

  • Animals
  • Model Building
  • Nature and Environment


Access Rights:

  • Free access



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