Principle Of Fossil Succession

25 July 2022
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Principle of fossil succession
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Fossil organisms succeed one another in a definite and determinable order, and therefore any time period can be recognized by its fossil content.
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Principle #1
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Have been very common, so chances of individuals being buried is good
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Principle #2
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Have hard parts, so chances of fossilization are good
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Principle #3
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Have a wide geographic range, so that correlation over wide region is possible
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Principle #4
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Lived in (or could be deposited in) different environments, so can be found in different formations
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Principle #5
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Have some distinctive features, so it can be recongnized from closely related forms
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Principle #6
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Have a short geological duration (a few million years at most), so finding a fossil of the species in a rock means it had to e deposited in those few million years
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Preserved remains
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Organisms are preserved in substances such as tar, amber, or ice.
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Mold
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A hollow area in sediment in the shape of an organism or part of an organism.
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Cast
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A copy of a shape of the organism
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Carbon film
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An extremely thin coating of carbon on rock
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Trace fossils
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Provide evidence of the activities of ancient organisms.
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Examples of trace fossils
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Fossil footprints, trails, and burrows
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What do fossils prove?
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Provides evidence about the history of the life of earth. And how organisms changed over time