Fossils as Evidence of Past Life

Active learning makes abstract concepts like fossil formation and interpretation tangible for Year 6 students. By handling materials and working through simulations, students connect slow geological processes to the evidence they see in rocks and museums. This hands-on approach builds lasting understanding beyond what textbooks alone can offer.

• Year 6
• Science
• 4 activities
• 40 min–50 min

Learning Objectives

1. Classify different types of fossils based on their formation process (e.g., cast, mold, imprint).
2. Explain how specific fossil features, such as tooth shape or leaf venation, provide evidence about an organism's past environment and diet.
3. Analyze the chronological order of fossils found in different rock strata to infer the relative ages of ancient life forms.
4. Synthesize information from various fossil discoveries to construct a narrative about evolutionary changes in a specific lineage over time.

Experiential Learning

⏱ 40 min·Pairs

Hands-On Fossil Making: Plaster Casts

Give pairs soft clay and natural objects like shells or leaves. Students press objects into clay to form moulds, pour plaster of Paris over them, and wait for drying. They then carefully excavate casts and discuss similarities to real fossils.

Prepare & details

Explain how fossils are formed and what they tell us about living things from the past.

Facilitation Tip: During the plaster casts activity, circulate with pre-made models to show students how fossils can look different from the original organism, reinforcing the idea that casts preserve shape but not the original material.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Experiential Learning

⏱ 45 min·Small Groups

Fossil Dig Simulation: Excavation Challenge

Bury replica fossils and small artefacts in sand-filled trays or boxes. Small groups use brushes, trowels, and sieves to excavate slowly, sketch findings, and note positions. Groups present discoveries to the class.

Prepare & details

Describe how a fossil can provide clues about an animal's diet or environment millions of years ago.

Facilitation Tip: For the excavation challenge, assign roles so every student participates, such as recorder, digger, and photographer, to ensure accountability and varied engagement.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Stations Rotation

⏱ 40 min·Small Groups

Stations Rotation: Fossil Clues Stations

Prepare stations for diet analysis (teeth/jaws), environment clues (rock types), formation models (layered sediments), and timelines. Groups rotate every 10 minutes, recording inferences on worksheets before sharing.

Prepare & details

Discuss how the discovery of new fossils can change our understanding of past life.

Facilitation Tip: At the fossil clues stations, provide magnifying lenses and rulers, and set a two-minute timer per station to keep the rotation moving while ensuring focused observations.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Experiential Learning

⏱ 50 min·Whole Class

Whole Class Timeline: Life Through Time

Display fossil images or replicas chronologically. Students add cards with habitat or diet notes to a large timeline mural, debating placements based on evidence. Conclude with a class vote on key changes.

Prepare & details

Explain how fossils are formed and what they tell us about living things from the past.

Facilitation Tip: During the timeline activity, use string or paper strips to physically represent time spans so students grasp the relative scale of eras and periods.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Teaching This Topic

Teachers should emphasize process over product, guiding students to ask how and why fossils form rather than just memorizing names. Avoid rushing through the slow processes; use timelapse videos of sediment settling to illustrate how layers build over time. Research shows that students grasp deep time better when they manipulate models that compress millions of years into seconds, such as building layered sediment jars they can observe over weeks.

What to Expect

By the end of these activities, students will confidently explain how fossils form and what they reveal about past environments. They will analyze fossil clues to infer diets, climates, and evolutionary changes, and justify their thinking with evidence from their models and digs. Group discussions will show they can revise ideas when presented with contradictory fossil data.

Watch Out for These Misconceptions

Common Misconception

During Hands-On Fossil Making: Plaster Casts, watch for students who assume the plaster replica is the actual organism turned to stone.

What to Teach Instead

During the plaster casts activity, ask students to compare their cast to the original shell or leaf they used. Have them note that the plaster preserves the shape but not the original material, and introduce the term 'mineral replacement' as a way fossils form without the original bone or shell remaining.

Common Misconception

During Station Rotation: Fossil Clues Stations, watch for students who assume ancient animals looked identical to modern ones.

What to Teach Instead

During the fossil clues stations, provide replica trilobites and ammonites alongside modern examples like horseshoe crabs or nautilus shells. Ask students to compare structures such as eyes, shells, or legs, and record differences in a Venn diagram to highlight evolutionary changes.

Common Misconception

During Fossil Dig Simulation: Excavation Challenge, watch for students who believe fossils form quickly, such as within a few years.

What to Teach Instead

During the excavation challenge, have students build their dig site in layers, adding a new sediment layer each day for a week. Label each layer with the approximate time span it represents, so they see how layers accumulate over millions of years rather than days.

Assessment Ideas

Exit Ticket

After Hands-On Fossil Making: Plaster Casts, provide images of a mold, cast, and imprint. Ask students to label each and write one sentence explaining how it formed, using terms they practiced during the activity.

Quick Check

After Station Rotation: Fossil Clues Stations, display a four-layer rock diagram with different fossils in each layer. Ask students to identify the oldest fossil and explain their reasoning based on the principle of superposition, referencing the sediment layers they built during the dig simulation.

Discussion Prompt

During Whole Class Timeline: Life Through Time, pose a scenario where a newly discovered fossil shows a dinosaur with feathers, contradicting a long-held belief that it was scaly. Facilitate a discussion on how scientists use new fossil evidence to revise their understanding, connecting to the timeline activity where students organized evidence of change over time.

Extensions & Scaffolding

• Challenge students to design a 'mystery fossil' using craft materials, then swap with a partner to make a cast and analyze its features, justifying what past environment it might represent.
• Scaffolding: Provide sentence stems for fossil descriptions, such as 'The shape of this tooth suggests the animal ate... because...' to support students who struggle with inference.
• Deeper exploration: Invite students to research a real fossil discovery and present a short report on how it changed scientists' understanding of a species, using the 'Life Through Time' timeline as a reference point.

Key Vocabulary

Fossil	The preserved remains or traces of an organism that lived in the past, typically found in rock.
Sediment	Loose particles of sand, silt, and clay that accumulate over time and can eventually harden into rock, often preserving fossils.
Mineralization	The process where organic material in a fossil is replaced by minerals from the surrounding groundwater, turning the remains into rock.
Mold Fossil	An imprint left in the sediment by an organism. The original organism is gone, but its shape is preserved.
Cast Fossil	Forms when a mold fossil is filled in with minerals or sediment, creating a three-dimensional replica of the original organism.