fossils mr. skirbst earth science topic 24. fossils the preserved remains or evidence of a living...
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Fossils
Mr. SkirbstEarth Science
Topic 24
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Fossils
The preserved remains or evidence of a living thing
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Types of Fossils1. Petrification
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Types of Fossils1. Petrification
minerals replace organic material
Ex. Petrified wood
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Types of Fossils2. Molds
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Types of Fossils2. Molds
empty space left by plant of animal buried in sediment
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Types of Fossils2. Molds
empty space left by plant of animal buried in sediment
3. Casts
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Types of Fossils2. Molds
empty space left by plant of animal buried in sediment
3. Castsa filled in mold
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Types of FossilsMolds & Casts
CAST
MOLD
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Types of Fossils4. Imprints
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Types of Fossils4. Imprints
impression in soft sediment
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Types of Fossils5. Preservation
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Types of Fossils5. Preservation
entire specimen preserved (hard and soft parts)
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Types of Fossils5. Preservation
entire specimen preserved (hard and soft parts)
Freezing – trapped in ice
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Types of Fossils5. Preservation
entire specimen preserved (hard and soft parts)
Freezing – trapped in iceAmber – trapped in sap
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Types of Fossils5. Preservation
entire specimen preserved (hard and soft parts)
Freezing – trapped in iceAmber – trapped in sapTar pit – trapped in tar
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Types of Fossils5. Preservation
entire specimen preserved (hard and soft parts)
Freezing – trapped in iceAmber – trapped in sapTar pit – trapped in tarPeat pit – trapped in peat / bog
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Types of Fossils6. Trace Fossils
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Types of Fossils6. Trace Fossils
tracks, trails, footprints
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Age of Fossils
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Age of Fossils1. Relative Age:
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Age of Fossils1. Relative Age:
- determining age “relative” to others
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Age of FossilsLaw of Superposition
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Age of FossilsLaw of Superposition
in sedimentary rock layers, older rocks are beneath younger rocks
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Age of FossilsLaw of Superposition
YOUNG
OLD
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Age of FossilsIndex Fossils
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Age of FossilsIndex Fossils
- layers of rock with index fossils are close in age to other layers with the same kind of fossils
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Age of FossilsIndex Fossils
1
1
2
2
3
3
4
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Age of Fossils2. Absolute Age
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Age of Fossils2. Absolute Age
determining the “actual” age of fossils
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Age of FossilsRadioactive Dating
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Age of FossilsRadioactive Dating
- radioactive elements decay at a constant rate
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Age of FossilsRadioactive Dating
- radioactive elements decay at a constant rate
Half-life – time it takes for ½ of element to decay