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View compareRock Layers & the Fossil Record Training Center
Ari Raider's Training Materials · Jurassic Attack · Training Center 2 of 6
Rock Layers & the Fossil Record
The Shell Wall is a calendar written in stone — and someone has shuffled the pages. Restack the bands the way the Earth laid them down or the wall comes down.
What you're training for
At the Shell Wall, four fossil-packed bands have been pulled loose and stacked in the wrong order, and the whole wall is bowing outward. It holds for whoever can rebuild the layers oldest-first. Train here first; prove it in the simulation.
The science
- Superposition: in undisturbed rock the bottom layer is the oldest — it was laid down first, and everything after piled on top.
- Deeper fossils are older fossils, which is how the rock record becomes a timeline of life.
- A wall of sea shells far from any ocean means that layer was once a seafloor — layers record the environment they formed in.
- Distinctive fossils like Turritella snails act as index fossils, letting geologists match layers of the same age across different places.
Teach it today — no prep
The classroom cliff. Tape four strips of paper up the wall as "layers", each with a different sketched fossil. Ask: which is oldest, which is newest, and what was this place when each layer formed? Then flip two layers and let students explain how they'd catch the tampering — that's exactly what they'll do in the Realm.
Trained and ready? Prove it at Stop 2 — the Shell Wall. Free, no logins, progress saved on the device.
Enter the Realm at Stop 2Resources in this training center
Worksheets, reading passages, flashcards and printables for this lesson are being added — new resources land here first. Get one email a month when they do, or browse the whole free library.
The hands-on half: the Jurassic Attack Adventure Kit puts six real specimens, six Digs, six Gemlings and the Realm map in your students' hands — $19.99, or $15 a student for classrooms.
More Jurassic Attack training
Petrified Wood · Fossil Layers · Trace Fossils · Fossil Preservation · Dinosaur Teeth · Fossil Bone · Enter the Adventure →