Earth Science Grade 8. Animal Dies Scavengers eat most of the flesh Bacteria eats away at the rest...
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Transcript of Earth Science Grade 8. Animal Dies Scavengers eat most of the flesh Bacteria eats away at the rest...
FOSSILSEarth Science
Grade 8
Animal Dies
Scavengers eat most of the fleshBacteria eats away at the restSediments cover the remainsGroundwater starts to filter through
Rock is deposited into the bones one cell at a time.A fossil is made!
Eat away the flesh
Eats the rest
(groundwater) passes through
Cover the remains
Change to sediments
Replaces the bone cells
Fossil• Once living material or traces of living material that has become preserved in rock
FOSSIL FORMATION
Petrified remains• Minerals fill in the space held by the original substance• Examples: trees, bones, shells
Carbon film• When leaves or soft bodies materials buried• Examples: film of carbon left behind
Mold• Hole left behind when groundwater dissolves a shell or boneCast• When minerals fill
in the mold
Demo
Trace Fossils• Fossils that show how the organism lived• Examples: footprints, tail marks, eggs, nests, burrows
Trace Fossils
Trace Fossils
Borrows
Trace Fossils
Nest of Eggs
Index fossils• Used to show specific units of time• The best index fossils lived for a short period, but were wide spread
Index Fossils
Index Fossils
Video Clip