Fossil Formation

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Normal fossils are formed from the hard parts of an animal or plant and...
fossils that are made this way are then covered in soil and silt
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Fossils can be made by - 1. Gradual replacement by minerals as...
things like teeth, shells and bones don't decay easily
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They are gradually replaced by...
minerals as they decay, forming a rock-like substance
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The surrounding sediments also turn to rock but the fossil stays...
distinct inside the rock
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2. From casts and impressions as sometimes fossils are formed when an organism...
is buried in a soft material like clay
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The clay later hardens around it and the organism...
decays, leaving a cast of itself
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3. From preservation in places where decay doesn't happen (like a bog) as...
in amber and tar pits, there is no oxygen or moisture so decay can't survive
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In glaciers, it is too...
cold for decay microbes to work
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Peat bogs are too...
acidic for decay microbes
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Evidence provided by Fossils: 1. Oldest fossils are found in the...
bottom layers of rock
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2. Gives a timeline to look at the...
development of moderm day species
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Other cards in this set

Card 2

Front

things like teeth, shells and bones don't decay easily

Back

Fossils can be made by - 1. Gradual replacement by minerals as...

Card 3

Front

minerals as they decay, forming a rock-like substance

Back

Preview of the back of card 3

Card 4

Front

distinct inside the rock

Back

Preview of the back of card 4

Card 5

Front

is buried in a soft material like clay

Back

Preview of the back of card 5
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