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Geologic Time
Selected definitions
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| Angular Unconformity | An uncomformity in which the strata below dip at an angle different from that of the beds above |
| Conformable | layers of rock that were diposited without interuption |
| Disconformity | a type of inconformity in which the beds above and below are parallel |
| Index Fossil | a fossil that is associated with a particular span of geologic time |
| Noncomformity | an uncomformity in which older metamorphic or intrusive igneouis rocks are overlain by younger sedimentary strata |
| radiometric dating | the procedure of calculating the absolute ages of rocks and minerals that contain radioactive isotopes |
| Radiocarbon | Carbon-14: The radioactive isotope of carbon, which is protibe isotope of carbon, which is produced continually in the atmosphere and is used in dating events as far back as 40,000 yrs. |
| Unconformity | a surface that represents a break in the rockrecord, caused by erosion and nondeposition |
| order of those thing | eon, era, period, epoch |
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