| Term | Definition |
|---|
| Petrified | Minerals replace all or part of an organism |
| Mold | When the hard part of the organism is buried in sediment. |
| Cast | Water carrying dissolved minerals and sediment seep into the empty space of a mold |
| Carbon films | Gases leave carbon behind on rocks |
| Trace or Index | Sediment buried sand, became solid rock |
| Preserved | organisms with little or no change. |
| Era | largest |
| Period | middle |
| epochs | small |
| Cenozoic | man and mammals |
| Mesozoic | Reptiles, Dinosaur |
| Paleozoic | Fish, inveratbrates |
| Precambriam | Earth forms, early life |
| Extinction | Something that no longer exists on earth |
| Evolution | the process by which all different kinds of living things have changed over time |
| Absoulte | the age of a rock given as a number of years since it was formed |
| Relative | the rocks age being compared to the age of other rocks |
| Law of superposition | each layer is older than the layer above it and younger than the below it |
| Principle of uniformitarianism | law of nature has not changed over time |
| Unconformity | a place where rock was eroded and new layers form over it |
Combine with other sets
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