Activity 01
Edible Rock Layers
Students create a model of sedimentary rock layers in a clear cup using edible ingredients like crushed cookies for sand, pudding for mud, and gummy worms or chocolate chips for fossils. Each layer represents a different time period, visually demonstrating the principle of superposition.
Explain why fossils found in deeper rock layers are generally older than those in shallower layers.
Facilitation TipAsk students to narrate the 'story' of their cup, explaining which fossil is the oldest and why.
What to look forExit Ticket: Provide students with a simple, unlabeled diagram of three rock layers with a unique fossil in each. Ask them to circle the oldest fossil and put a square around the youngest one.
RememberUnderstandApplyAnalyzeSelf-ManagementRelationship Skills
Generate Complete Lesson→· · ·
Activity 02
My Personal Time Capsule Core Sample
Students draw a cross-section of a 'core sample' of their own life, with layers representing different years. They draw objects or 'fossils' in each layer that were important to them at that age, with the baby years at the bottom.
Analyze a diagram of rock layers to determine the relative ages of different fossils.
Facilitation TipUse this personal analogy to reinforce that deeper layers represent things that happened earlier in time.
What to look forCreate a 'Fossil Story' worksheet. Students analyze a more complex diagram of rock layers and answer short-response questions about the sequence of events and the relative ages of the organisms.
RememberUnderstandApplyAnalyzeSelf-ManagementRelationship Skills
Generate Complete Lesson→· · ·
Activity 03
Fossil Dig Simulation
Prepare bins with layers of sand, soil, and gravel, hiding different 'fossils' (like pasta shapes or small plastic animals) in each layer. Students act as paleontologists, carefully excavating the fossils and recording which layer they found them in to determine their relative ages.
Identify patterns in the fossil record that show how life has changed over time.
Facilitation TipEncourage students to create a data table to log their findings before drawing conclusions.
What to look forStudents complete a 'I can...' checklist with statements like 'I can explain why fossils in deep layers are older' and 'I can find the youngest fossil in a picture,' rating their confidence.
RememberUnderstandApplyAnalyzeSelf-ManagementRelationship Skills
Generate Complete Lesson→A few notes on teaching this unit
Begin with concrete, hands-on models to illustrate the concept of layering, or superposition. Use clear containers with sand, gravel, and objects to represent how layers build up over time. Constantly refer back to this model when looking at diagrams. Use think-alouds to model how to interpret a rock layer diagram, saying things like, 'First this happened, then this layer formed on top...'
By the end of this topic, students will be able to analyze a diagram of rock layers to determine the relative ages of fossils and explain how the fossil record tells a story of change over time.
Watch Out for These Misconceptions
All rock layers are perfectly flat and undisturbed, just like a stack of pancakes.
Earth's surface is active. Forces within the planet can cause rock layers to tilt, fold, or even break. While they are laid down flat initially, their final appearance can be very different.
Humans and dinosaurs lived at the same time.
The fossil record shows that dinosaurs went extinct about 65 million years ago. The very earliest human ancestors appeared millions of years after that. There are no human fossils in the same rock layers as dinosaur fossils.
Fossils are found everywhere and are easy to find.
Fossilization is a very rare event that requires specific conditions, like rapid burial in sediment. Most living things decompose without leaving a trace, which is why the fossil record is an incomplete story of life on Earth.
Methods used in this brief