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Geological Time

TermDefinition
Amber fossil resin of vegetable origin
Fossil any remains of a former living thing
Cast impression or mold made of something
Index Fossil widely distributed fossil; used in determining age of relative formation
Mold in order to make a casting
Permineralization process of fossilization in which mineral deposits form internal casts of organisms
Trace Fossil fossilized track in a sedimentary rock that records presence/behavior of organism that made it
Cross-Cutting Relationships igneous intrusion is always younger than the rock it cuts across
Geologic Time succession of eras/periods/epochs as considered in historical geology
Lateral Continuity layers of sediment initially extend laterally in all directions
Original Horizontality layers of sediment are originally deposited horizontally under the action of gravity
Relative Age geologic age of a fossil organism defined relative to other organisms rather than years
Superposition order in which sedimentary strata are superposed one above another
Unconformity discontinuity in rock sequence
Uniformitarianism relating to the thesis that processes that operated in the remote geological past are not different from those observed now
Absolute Age true age of rock/fossil
Half-Life brief period in which something flourishes before dying out
Ice Core core sample that is typically removed from an ice sheet
Isotope two or more forms of a chemical element that have the same atomic number but have different number of neutrons
Radiometric Dating any method of determing the age of earth materials
Differentiation the process by which cells or tissues change from relatively generalized to specialized kinds, during development
Outgassing to remove by heat/reduced pressure
Supercontinent protocontinent of geologic past
Pangaea land mass that existed when all continents were joined
Orogeny process of mountain making
Evolution process of formation/growth development
Natural Selection the process by which forms of life having traits that better enable them to adapt to specific environmental pressures
Created by: 3083291
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