index fossils. what are fossils? preserved remains or traces of living things. they help show how...
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![Page 1: Index Fossils. What are Fossils? Preserved remains or traces of living things. They help show how the Earth has changed over time. They are clues to what](https://reader034.vdocuments.mx/reader034/viewer/2022051014/5515a389550346486b8b5eef/html5/thumbnails/1.jpg)
Index Fossils
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What are Fossils?
• Preserved remains or traces of living things.
• They help show how the Earth has changed over time.
• They are clues to what the environment was like in the past.
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TRACE FOSSILS
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TRUE FORM FOSSILS
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MOLD FOSSILS & CAST FOSSILS
CASTMOLD
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How do Fossils Form?
1. The animal dies.
2. The remains are buried in sediment.
3. The sediment turns to rock and preserves the shape or trace of the animal.
• Usually found in Sedimentary Rocks.
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How is a Fossil Created?
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What is an Index Fossil?
• Index fossils are used to help Geologists match different rock layers that may be located far apart.
• Helps to tell the relative age of the rock layers.
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What makes a Fossil an Index Fossil?
1. The fossil must be found in a lot of locations around the globe.
2. They must have lived during a distinct time period. That means Scientists know that they lived and became extinct during a set time period. They’re not found in every layer, just one layer.
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Find the Index Fossils?
BECAUSE IT’S FOUND IN ONLY ONE LAYER OF ROCK, WE CAN INFER THAT THIS
ANIMAL LIVED AND BECAME EXTINCT IN A SHORT AMOUNT OF TIME. THAT MAKES IT
A GOOD INDEX FOSSIL.
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Find the Index Fossils?
THOUSANDS OF MILES
APART
BECAUSE THE FOSSIL IS FOUND IN LAYERS IN DIFFERENT PLACES ON THE EARTH IT MAKES A GOOD INDEX FOSSIL.
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Here’s how index fossils work.
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Now lets try to use index fossils to figure out the relative age of some rock layers as a team.