Fossils Chapter 9 Section 1 Pgs. 242 - 249.

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Presentation transcript:

Fossils Chapter 9 Section 1 Pgs. 242 - 249

Fossil Formations Fossils – remains, imprints, or traces of prehistoric organisms. Show when, where, and how lived Most remains disappear because of scavengers and bacteria. Conditions for fossils to form: Quick burial Have hard parts such as bones

Preservation of Fossils Tiny spaces within most hard parts (bones) Permineralized remains – fossils in which the spaces inside are filled with minerals from groundwater. If preserved fossil can have: DNA Can contain other fossils

Carbon film – carbon residue left to form shape of organism after liquid and gases are forced out. Coal – created after plant matter completely carbonized, creates a fuel source Mold – hard part decays or dissolves leaving behind a space Cast – mineral water or other sediments enter the cavity and form a new rock or copy

Index Fossils Remains of species that existed on Earth for short periods of time, a lot of them, and in many places. Helps determine age of rock layers

Ancient Environments Fossils can determine what past environments were like in an area long ago. Determine whether an area was land or covered with water. Determine past climates

Questions What is a fossil? What do the conditions need to be to form a fossil? If a fossil is preserved, what can it still contain? What are index fossils?