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Fossil
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Geological History

Unit 6 vocab

TermDefinition
Fossil A remain, imprint, or trace of prehistoric life
Index Fossil Remains of once-living things from millions of years ago
Permineralized Remains Fossils filled with minerals from groundwater
Molds and Casts A type of body fossil
Original Remains Still-existing fossils of prehistoric animals
Trace Fossils Fossil consisting of imprint or track of an organism
Relative Age Age of something compared with other things
Superposition Order of sedimentary strata
Horizontality The layers in the soil
Absolute Age Age in years of a rock or other object
Half-life The time taken for half the atoms in an isotope to decay
Isotopes Amounts of the same elements with different numbers of neutrons
Radioactive Decay Process where some isotopes break into smaller isotopes
Geological Time The division in Earth's history
Eon The longest subdivision in geological time
Era Subdivided into periods
Period Characterized by types of life that existed worldwide
Epoch Characterized by differences in life-forms
Pangaea The world when dinosaurs roamed the Earth
Trilobite Organism with 3-lobed exoskeleton
Precambrian Longest part of Earth's history
Mesozoic Era The time of the dinosaurs
Cenozoic Era The time of the first humans
Created by: 3083436
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