1. Do Now: In your notebooks, tell me what you know about fossils.
Aim: What are fossils?
Do Now: In your notebooks, tell me what you know about fossils.
Bat
Trilobite (lived in shallow seas)
Leaf

2. I. Fossils - the preserved remains or traces of prehistoric life.
- found only in sedimentary rock.
- tells a story about the areas environment and what used to exist there.

3. II. Fossil Formation In order for fossils to form they must:
Click Here
In order for fossils to form they must:
- be rapidly buried
- have hard parts (teeth, bones or shells)
water and minerals fill in the spaces inside of bones (cells). These minerals crystalize in the shape of the bone creating the fossil.

4. III. Types of fossils
Impressions (trace): when an organism is pressed into soft sediment and the imprint is preserved during Lithification.
Amber: when an organism is trapped in tree sap that solidifies trapping the organism inside. (“Jurassic Park”)
Petrified wood: when minerals replaces the empty spaces within and organism harden preserving the shape and look.
Casts and Molds: when organisms are buried entirely and create a void in the rock with the impressions of the organism. 4

5. IV. Index Fossils Index fossils – relate to one specific time.
These fossils must be…
- widespread geographically (many different outcrops)
- limited to a short span of geologic time (found in one layer)
- occur in large numbers (many of the same kind)

6. Which fossil is a good index fossil
Which fossil is a good index fossil. Use your ESRT page 8 and 9 to name the fossil. Match the pictures at the bottom of the page with those in the outcrops.

7. Which fossil is an index fossil.
Which fossils are poor examples of an index fossil, WHY?

8. NY State Fossil
Eurypterus
(Silurian)

9. Closure: Place rock layers and events in relative order

10. (some questions use ESRT page 3)
Closure 2:
Review book page # 1-14
(some questions use ESRT page 3)