1. Fossils

2. livingFossils - the preserved remains or evidence of living things

3. Types of Fossils Original Remains- Unchanged remains of plants and animals –Examples Hard parts : Bones, Shells Animals trapped in ice : Wooly Mammoth Animals trapped in tar or in amber

4. Saber- toothed Tiger Amber with an insect Frog in Amber Woolly Mammoth in ice

5. Fossilized dinosaur bones in sandstone (sedimentary rock)

7. Tar is thick and sticky The La Brea tar pit in Los Angeles, California is famous for its many fossils!

8. Types of Fossils Replaced Remains : Hard parts of plants or animals are replaced by minerals over time. The minerals are in the shape of the organism. –This occurs when water containing minerals seeps through the plant/animal material. –Petrified wood forms in this way

9. Example: Petrified Wood Minerals have replaced all of the wood cells and turned this wood into rock!

11. Types of Fossils Molds and Casts: Impressions and copies Molds are created as mud or sediment becomes rock around dead organisms. Casts are created as minerals get deposited into the molds and then harden. They make a copy of the fossil. Ice cube tray= Mold Ice= Cast

12. Example: Cast of an Ammonite

13. Types of Fossils Trace Fossils : Evidence of organisms –Footprints, teeth marks, tunnels –Carbonaceous film: thin film of carbon resembling a silhouette of the organism

14. Trilobite: Index fossil of Paleozoic Graptolite: Index fossil of the Silurian

15. Question: Fossils are usually formed when the organism dies and gets buried in mud or sand. As a result, What type of rock are fossils usually found in?

16. Questions: Why are fossils NOT usually found in igneous rock?

17. Questions: What 4 settings (environments) could fossils be preserved?

18. Questions: What are the 5 types of fossils?