looking at fossils 12/16/14 6-4 pgs. 146-150 in: how do you think fossils form? put your drw on the...
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Looking at Fossils 12/16/146-4 pgs. 146-150
IN: How do you think fossils form?
Put your DRW on the box
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What are fossils?
Fossil – any naturally preserved evidence of life.
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Types of Fossils1. In Rocks2. Petrification3. In Amber4. Mummification5. Frozen Fossils6. In Tar7. Trace Fossils8. Molds and Casts
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1. In RocksOccasionally, body parts get
buried quickly in sediment and are preserved while the sediment turns to rock.
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What type of rock has fossils?Sedimentary
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Mineral Replacement
2. Petrification – a process in which an organism’s tissues are completely replaced by minerals.
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3. In AmberHardened tree sap is called
amber.
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4. MummificationWhen organisms die in dry
places, such as deserts, they can sometimes dry out so fast that there isn’t enough time for even their soft parts to decay.
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5. Frozen FossilsAnimals freeze in glaciers and
are preserved until the glacier thaws thousands of years later.
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6. In TarOrganisms get trapped and sink
in tar pits which preserve the organism.
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La Brea Tar Pits, Los Angeles
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7. Trace Fossils – any naturally preserved evidence of an animal’s activity.
Tracks
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Johnson Farm – St. George, Utah
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Coprolites – preserved feces.
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8. Molds and CastsA mold is a cavity in the ground
or rock where a plant or animal was buried.
A cast is an object created when sediment fills a mold and becomes a rock.
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Using Fossils to Interpret the PastFossils can reveal changes that have occurred in parts of the Earth.◦Coral-reef fossils have been found in Iowa.
◦Fossils of marine organisms have been found on tops of mountains in Canada.
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Using Fossils to Date Rocks
Index fossils – a fossil that is used to date the rock layers in which it is found.
Tropites lived between 230 million and 208 million years ago.
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OUT: If you find rock layers containing fish fossils in a desert, what can you infer about that area of the desert?
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