fossils. livingfossils - the preserved remains or evidence of living things
TRANSCRIPT
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Fossils
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Fossils• Fossils- the preserved remains
or evidence of livingliving things
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Types of Fossils• Original Remains- Unchanged
remains of plants and animals– Examples
• Hard parts: Bones, Shells
• Animals trapped in ice: Wooly Mammoth
• Animals trapped in tar or in amber
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Saber-toothed Tiger
Amber with an insect
Frog in AmberWoolly Woolly Mammoth Mammoth in icein ice
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Fossilized dinosaur bones in sandstone Fossilized dinosaur bones in sandstone (sedimentary rock)(sedimentary rock)
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Tar is thick and sticky
The La Brea tar pit in Los Angeles, California is famous for its many fossils!
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Types of Fossils• Replaced Remains: Hard
parts of plants or animals are replaced by minerals over time. The minerals are in the shape of the organism. – This occurs when water
containing minerals seeps through the plant/animal material.
– Petrified wood forms in this way
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Example:
Petrified WoodPetrified Wood
Minerals have replaced all of the wood cells and turned this wood into rock!
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Types of Fossils• Molds and Casts: Impressions and copies
• Molds are created as mud or sediment becomes rock around dead organisms.
• Casts are created as minerals get deposited into the molds and then harden. They make a copy of the fossil.
Ice cube tray= Mold
Ice=
Cast
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Example: Cast of an Ammonite
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Types of Fossils• Trace Fossils: Evidence of organisms
–Footprints, teeth marks, tunnels–Carbonaceous film: thin film of carbon
resembling a silhouette of the organism
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Trilobite: Index fossil of Paleozoic
• Graptolite: Index fossil of the Silurian
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Question:• Fossils are usually formed when the
organism dies and gets buried in mud or sand. As a result, What type of rock are fossils usually found in?
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Questions:• Why are fossils NOT usually found
in igneous rock?
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Questions:• What 4 settings (environments) could
fossils be preserved?
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Questions:• What are the 5 types of fossils?
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