| Term | Definition |
|---|---|
| Uniforitarianism | Principle that geologic processes that occurred in the past |
| Relative age | Age of an objects in relation to the ages of other objects |
| Law of superposition | Law that a sedimentary rock layer is older than the layers above it and younger than the layers below it |
| Unconformity | Break in the gelogic record created when rock layers are eroded or when sediment is not deposited for a long period of time |
| Law of cross cutting cutting relationships | The principle that a fault or body of rock is younger than any other body of rock that it cuts through |
