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How do fossils form?

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Megan Murray

on 18 November 2013

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Transcript of How do fossils form?

How do fossils form?
Rocks hold clues to life These clues are called FOSSILS!
We find FOSSILS in sedimentary rock like sandstone, limestone or shale.
A dead plant or animal would be buried quickly by sediment (sand or mud).
By being buried, they were preserved.
The soft parts of the body would rot, leaving only the hard parts that were preserved.
Unburied parts would have been eaten or destroyed by weather.
Sediment hardened. Fossil was formed!
Types of Fossils!
Trace Fossils
Mold Fossils
Cast Fossils
Show changes long-ago animals made in their surroundings.
Tracks, burrows, droppings (poop!), and worm holes are all examples of TRACE fossils.
They are clues to scientists about life during that time period.
A mold fossil is an imprint made by the OUTSIDE of a dead plant or animal.
When water slowly washes the organism's remains away, you are left with a mold!
Cast fossils -- Sediment that sometimes fills a mold fossil, creating a cast mold. It has the same outside shape as the original organism.
Amber -- Once-living organisms have gotten trapped in sap or tar and have been completely preserved.
Petrified -- Water containing minerals soaked into fallen trees. The wood rotted away leaving minerals behind.
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