Term
| in what type of rock can fossils be found? |
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Definition
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Term
| who proposed the principle of uniformitarism? |
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Definition
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Term
| what does the principle of uniformitarism state? |
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Definition
| forces & process that we observe today have been at work for a very long time. |
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Term
| what law did Nicolaus Steno propose? |
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Definition
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Term
| what type of dating places rocks in a proper sequence (when they were formed)? |
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Definition
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Term
| what does the law of superposition state? |
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Definition
| in an undeformed sequence of sedimentary rocks, each bed is older than the one below it, and younger than the one above it. |
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Term
| what is an unconformitie? |
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Definition
| represents a long period during which deposition stopped, erosion removed previously formed rocks and then deposition resumed. |
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Definition
| the remains or traces of prehistoric life. |
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Term
| what does fossil succession state? |
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Definition
| that fossils organisim succed one another in a definite and determinable order. |
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Term
| how do geologist use index fossils? |
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Definition
| match rocks of the same age and different regions |
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Term
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Definition
| when nuclie spontaniously break apart, or decay |
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Term
| what is half-life in radioactive sample? |
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Definition
| time it takes for half of the nuclie to decay to its stable isotope |
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Term
| in an isotope, what is different? |
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Definition
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Term
| geologist use carbon-14 and carbon-12 for what purposes? |
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Definition
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Term
| how long ago did abundant fossil evidence first appear in the geologic record? |
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