Terms in this set (14)
Matching up rock layers (using fossils and rock type) to determine the geologic history of an area.
A trace of an ancient organism that has been preserved in rock.
Distinctive fossils used to establish and compare relative ages of rock layers and fossils. These fossils are widely distributed organisms that lived during only one short period.
Determining whether an object or event is older or younger than other objects or events
Determining the actual age of an event or object in years.
Process in which some isotopes break down into stable elements
Length of time required for half of the radioactive atoms in a sample to decay.
Law of Uniformitarianism
The idea that the same processes we see occurring now also occurred in the past.
A gap in the geologic record that shows where rock layers have been lost due to erosion.
Rocks are tilted from the original horizontal position.
The bending of rock layers due to stress in the Earth's crust
The rising of regions of the Earth's crust to higher elevations.
A piece of an older rock that becomes part of a new rock.
Magma cutting through formed layers of sedimentary rock that then cools and hardens.