| The Rock Record | The Fossil Record | The Geologic Time Scale | Precambrian and Paleozoic Eras | Mesozoic and Cenozoic ErasS |
|---|---|---|---|---|
100What is Law of Superposition
Sedimentary rock layers that are younger than layers below...
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100What is paleontology
The study of fossils...
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100What is evolution
The gradual development of new organisms from preexisting organisms...
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100What is 4.6 billion years ago
The Earth formed....
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100What is 70% or 78%
The percentage of land organisms that died at the end of the Permian Period...
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200What is trace fossil
A fossilized mark formed by the movement of an animal...
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200What is sedimentary rock
The type of rock in which almost all fossils are discovered...
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200What is mass extinction
An episode during which an enormous number of species dies...
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200What is AFTER the Precambrian time
The Paleozoic Era occured...
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200What is angiosperm
The earliest flowering plant, which appeared during the Cretaceous Period...
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300What is uncomformity
A break in the geologic record...
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300What is fossil
The remains of an animal or plant that lived in a previous geologic time...
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300What is geologic time scale
A chart outlining the development Earth and life on Earth...
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300What is 540 million years ago
The Precambrian time ended...
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300What is Cenozoic Era
The era that is called the Age of Mammals...
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400What is radiometric dating
Determining absolute age by comparing radioactive and stable isotopes...
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400What is igneous or metamorphic rock
Types of rock in which fossils are rarely discovered...
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400What is 206 MILLION years ago
"206 Ma" means...
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400What is Precambrian rocks were damaged and therefore could not be identified.
Little is known about the Precambrian time because...
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400What is Tertiary Period
The period of the Cenozoic Era that includes the time before the last ice age....
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500What is Uniformitarianism
Current geologic processes are the same as those that were at work in the past...
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500What is cast
The type of fossil that is formed when mud fills a mold and hardens...
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500What is impact hypothesis
A theory that a meteorite caused the extinction of dinosaurs...
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500What is stromatolites
Precambrian fossils consisting of reeflike deposits fromed by blue-green algae are called...
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500What is the Age of Reptiles
Another name for the Mesozoic Era...
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