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11 Cards in this Set
- Front
- Back
Trilobite
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organism with a three- lobed exoskeleton that was abundant in Paleozoic oceans (considered index fossils)
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Epoch
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next similar division of geologic time after the period
(characteristics matter by region) |
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Geologic (Time Scale)
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division of Earth's history into time units based largely on the types of life-forms that lived only during certain periods
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Organic Evolution
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change of organisms over geologic time
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Time Scale
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a unit of geological time during which a system of rocks formed
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Species
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group of organisms that reproduces only with other member of their own group
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Eon
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eons are the longest portions of geologic time
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Natural Selection
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process by which organisms that are suited to a particular environment are better able to survive and reproduce than organisms that are not
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Era
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second-longest division of the geologic time scale; is subdivided into periods and is based on major worldwide changes in types of fossils
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Pangaea
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super continent formed when sea level dropped and continents came together to form one giant landmass
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Period
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third longest division of geologic time
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