the fossil record
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The Fossil Record. Chapter 8.3. The Fossil Record. Paleontology = study of fossils Fossils are the remains of an organism that lived a long time ago. Fossilization. Fossils most often preserved in sedimentary rock. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 8.3
The Fossil Record
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Paleontology = study of fossils
Fossils are the remains of an organism that lived a long time ago.
The Fossil Record
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Fossils most often preserved in sedimentary rock.
Sediments cover the fossils. This slows/stop the process of decay (by bacteria) and prevents dead organisms from being eaten.
Normally only hard parts of organisms become fossilsEx. Bones, shells, teeth, and wood
Fossilization
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MummificationFound in dry places
How Fossils Form
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AmberHardened tree sap (amber) traps insects,
preserving it when it hardens
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Tar SeepsOccurs when petroleum comes to the surface
of the EarthOrganisms get stuck in the sticky tar
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FreezingLow temperatures protect and preserve
organisms in ice and frozen soil – no bacteria
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PetrificationMineral solutions (ex. Silica, calcite, and
pyrite) replace the organic material, creating a mineral replica of the original organism
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Imprints – ex. of leaves stems, flowers, and fish
Molds and Casts – either an empty cavity or a replica
Coprolites – fossilized dung/waste material
Gastroliths – stones in dinosaur digestive systems
Trace Fossils – ex. Tracks, footprints, borings, and burrows
Types of Fossils
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