- Dirt, mud and sand are dumped in layers, which then harden to form rock layers
- Rocks are stacked in layers containing fossils, with the oldest fossils in the deepest layers, and the younger fossils near the top
- There are thousands upon thousands of layers in the earth's crust.
- The most recent three layers were created in the Paleozoic era, Mesozoic era, and Cenozoic era
Questions
- What do rock layers contain?
- How many rock layers are there?
- Where do newer fossils go in rock layers?