fossils: formation and classification
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FOSSILS: FORMATION AND CLASSIFICATION
By: Mr. Marjonlien A. Mahusay
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FOSSIL - the remnants or trace of ancient living organisms
that has been preserved in rock or sediment
Kinds of rocks containing fossil
1. Sedimentary rocks
2. Volcanic ash deposits
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Fossilization- process of forming a fossil
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Kinds of fossils
2. Fossils preserved in an amber or tar
1. Frozen or dried bodies
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3. Preserved or replaced bones, teeth and shells
4. Petrified (premineralized) organisms
Turn into stone
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5. Mold and cast
6. Carbonized impressions
7. Trace fossils
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Fossil preservation
1.Death in an anoxic (oxygen free) environment
2. Rapid burial
3. Presence of hard parts
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Classifying fossils
• according to its morphology alone
Naming:• Compared fossil forms from known organisms
Ex. Fossil organize with spiral shell that does not contain internal chamber is classified as a member of class gastropoda
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Trilobites- 3 segmented shell that is divided across its width into 3 parts (arthropod)
Gastropods (snails)- spiral shell, does not contain internal chamber
Bivalves (clams & oysters) – shells that can be divide into 2 similar halves
Common invertebrate fossil
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Brachiopods – resemble screen like grid of cells
Crinoides – looks like a flower, stalks consist of numerous circular plates stacked on top of each other
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Grapholites – tiny carbon saw blades in a rock
Ammonites – spiral straight shell that contains internal chambers and has ridge surface
Corals
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