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Chapter 6 Section 4

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by

Courtney St.John

on 7 May 2013

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Transcript of Chapter 6 Section 4

Petrifaction Petrifaction is a process in which minerals replace an organism's
tissue. Fossils in Rocks Some organisms either begin to decay
or are eaten by other organisms. Sediment slows down decay. Hard parts of organisms,
such as as shells, and bones,
are resistant to decay. The hard parts of animals
are much more preserved
than muscles and skin. Fossils in Amber Some of the best insect
fossils are found in amber. Scientists can use the preserved bugs, like mosquito's, to find out the dinosaur's DNA pattern. One form is permineralization, , a process in which the pore space
in an organism's hard tissue is filled
up with mineral. Here's an example: Fossils in Asphalt There are places where asphalt wells up at the surface
in thick, sticky pools. The La Brea asphalt deposits in Los
Angeles, California are at least 38,000
years old. Organisms that have been trapped in the sticky pools have turned to fossils and scientists have learned of past environments in Southern California. Frozen Fossils In October 1999, scientists removed a 20,000 year old woolly mammoth frozen in the Siberian tundra. Because of cold temps and slow decay,
many frozen fossils are preserved from the last ice age. Thank you for your time! BY: Courtney St.John
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