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Relative Dating

Geologic Time Part 1

TermDefinition
Uniformitarianism The idea that forces working on our planet today worked on or planet in the past in the same manner
Relative Dating Determination of the age of a rock or event in relation to the ages of other rocks or events
Principle Of Superposition Basis for relative dating and the idea that the bottom layer is the oldest and each over lying layer gets younger
Original Horizontality Idea that sedimentary and igneous rocks are deposited in parallel layers to Earth's surface
Extrusions Molten rock flows onto the surface
Intrusions Molten rock squeezes into preexisting rock layers (Younger then the rocks that they crosscut, Exception to the principle of superposition)
Contact Metamorphism Temperature induced change of preexisting rocks along an intrusive
Faults A crack in the bedrock where movement has occured
Folds When thrusting rock layers cause preexisting rock layers to overturn
Correlation The process of showing that rocks or geologic events from different places are the same or similar age
Correlating Rocks Similarities in rock, rock sequence, mineral composition, color, and fossils
Fossils Remains or evidence of former living things (Examples: bones, shells, footprints, and organic compounds [DNA])
Index Fossils Fossil used to define and identify geologic periods (good index fossil is an organism that existed over a large geographic area and that have existed over a short period of time)
Geologic Time Markers Deposits spread over large areas that represent a specific date (Examples: volcanic ash deposits and meteorites impacts)
Created by: cmbinder197