1. Fossils and Rock Layers

2. How are Fossils preserved?
When an animal dies, the remains are covered by sediment. This sediment hardens and forms rock layers over time.
What process
moves the rocks
and sediment?

3. How are Fossils preserved?
When an animal dies, the remains are covered by sediment. This sediment hardens and forms rock layers over time.
What process
moves the rocks
and sediment?
EROSION

4. Types of Rocks Igneous Rock (formed when magma cools)
Metamorphic Rock (other rock types transformed by heat and pressure)
Sedimentary Rock (rock formed from minerals deposited near bodies of water; forms rock layers)
Fossils form in Sedimentary Rocks

5. Law of Superposition
In horizontal layers of sedimentary rocks, the oldest layer is at the bottom.
Each layer above
is younger than
the layers below it.

6. Law of Superposition Which layer is the oldest?
Which layer is the youngest?

7. Intrusions and Faults
Sometimes an igneous intrusion or fault will cut across or into the rock layers.
The intrusion or fault will always be younger than the rocks being intruded or displaced.

8. Intrusion Fault