Fossils Question How do you think fossils form
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Fossils!
Question • How do you think fossils form? • What do you think that fossils tell us?
Fossils • Are preserved remains or traces of living things. • Provide evidence of how life has changed over time.
How fossils form • Most form when living things die and are buried by sediments • Sediments slowly harden into rock and preserve the shapes of the organisms
Fossils
Sedimentary rock • Fossils usually found in this • Rock is made of hardened sediment.
Found • Most found in animals and plants that lived in or near quiet water such as swamps, lakes, or shallow seas. • Dies = hardens and only hard parts leave fossils
Found • Fossils found in rock include molds and casts, petrified fossils, carbon films, and trace fossils. • Others preserved in tar, amber or ice
Mold • Is a hollow area in sediment in the shape of an organism or part of an organism • Forms when hard part such as a shell is buried in sediment
Cast • Fossil that is a copy of an organism’s shape formed when minerals seep into a mold
Petrified fossils • Are fossils in which minerals replace all or part of an organism
Carbon film • Extremely thin coating of carbon on rock
Trace fossils • Provide evidence of the activities of ancient organism. • Ex: fossil footprints, trails, and burrows
Paleontologists • Collect and classify fossils
Fossil record • Provides evidence about the history of life on earth • Shows that groups of organisms have changed over time • Shows fossils occur in a particular order
Scientific theory • Well tested concept that explains a wide range of observations
evolution • Is the gradual change in living things over long periods of time • Fossil record shows millions of types of organisms have evolved.
Extinct • No longer exists and will never live on earth again
Extinction
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