| A | B |
|---|
| the idea that geologic change happens suddenly | catastrophism |
| the idea that geologic processes occurring now are the same as those in the past | uniformitarianism |
| the process of figuring out if an object is older or younger than another | relative dating |
| Altering of rock layers through folding, faulting, tilting, or intrusion | deformation |
| A break in the geologic record (missing rock) | unconformity |
| States that older rock layers will be below younger rock layers | law of superposition |
| says that sediment is generally deposited in flat, horizontal layers | principle of original horizontality |
| Unconformities appear in rock layers usually because of | erosion |
| This type of fossil only appears in one rock layer | index fossil |
| Most fossils are preserved in which type of rock? | sedimentary |
| Conditions that favor preservation of an organism as a fossil | rapid burial, possession of hard parts |
| The process of matching rock layers at different locations | correlation |
| ice/amber/tar | types of unaltered remains fossils |
| example of how fossils can help build detailed pictures of past environments | if there was coral, there was a warm, shallow sea |
| 1. dead organism becomes quickly buried 2. minerals replace hard parts 3. eventually hard parts are stone 4. buried fossil becomes exposed | order of fossil formation |
| states that a fault or intrusion must be younger than any geologic formation through which it cuts | principle of cross-cutting relationships |
| ideal sequence of rock layers arranged from oldest to youngest | geologic column |
