Activity 01
Simulation Game: Making a 'Quick' Fossil
Students press plastic dinosaurs or shells into salt dough to create 'mould' fossils. They then fill the mould with plaster of Paris to create a 'cast' fossil. This two-step process helps them understand how the original animal disappears but leaves its shape behind.
Why are fossils almost always found in sedimentary rock?
Facilitation TipDuring the simulation, circulate and ask each group to explain why they layered the sponge with sandy water to represent mineral replacement.
What to look forProvide students with images of different fossils (e.g., ammonite, leaf imprint, dinosaur bone, footprint). Ask them to write down the name of the fossil and whether it is a body fossil or a trace fossil, and one thing it tells us about the past.
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Activity 02
Inquiry Circle: The Mystery Layer
Provide groups with a 'sedimentary stack' (different coloured sands in a jar) containing hidden 'fossils' (small toys). Students must carefully remove layers from the top down and record what they find, discussing why the 'oldest' fossils are at the bottom.
How does a fossil act as a window into a past environment?
Facilitation TipFor the Mystery Layer, give each group two minutes to share one observation before recording class patterns on the board.
What to look forOn a slip of paper, ask students to write two key ingredients needed for an organism to become a fossil and one reason why fossils are usually found in sedimentary rock. Collect these as students leave.
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Activity 03
Think-Pair-Share: The Shell on the Mountain
Show a photo of a sea shell fossil found at the top of the Himalayas. In pairs, students must come up with a 'geographical theory' for how it got there. Share theories with the class to introduce the idea of tectonic plates lifting the seabed into mountains.
What would the world be like if organic matter never fossilized?
Facilitation TipIn the Think-Pair-Share, listen specifically for pairs who connect the shell on the mountain to past environments rather than just naming the shell.
What to look forPose the question: 'Imagine you found a fossilized fish in a desert. What does this tell you about the history of that place?' Facilitate a class discussion, guiding students to connect the fossil evidence to past environments and geological changes.
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Generate Complete Lesson→A few notes on teaching this unit
Teachers often rush to show fossil pictures, but students need to experience the rarity of fossilisation first. Start with the Fossil Lottery game to make the conditions real, then layer in the rock connection with the sedimentary tray. Use student talk to build explanations, not just teacher explanation.
Students will explain how fossils form through rapid burial and mineral replacement. They will identify why sedimentary rock holds most fossils and distinguish body fossils from trace fossils in images and discussions.
Watch Out for These Misconceptions
During the Collaborative Investigation The Mystery Layer, watch for students who believe any rock layer can hold fossils. Correction: Display three rock samples (sedimentary, igneous, metamorphic) and ask students to predict which one would most likely contain fossils from the Mystery Layer, using the game’s rules about burial and oxygen.
During the Think-Pair-Share The Shell on the Mountain, watch for students who think the shell is still alive or was recently alive. Correction: Show a cross-section diagram of the rock with the shell inside, and ask students to trace the shell outline with their finger, reinforcing that it is a copy in rock, not the original animal.
Methods used in this brief