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| A student finds a marine brachipod fossil in the Catskill region of NY. Which best explains the fossils presence at this location? |
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Definition
| The Catskill region was at a lower elevation when the brachiopod died. |
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in NY which happened more recently?
Taconian orogeny, extinction of dinosaurs, formation of Adirondaks, or intrusion of the Palisades Sill? |
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Definition
| Tthe extinction of dinosaurs. |
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Term
| Why are Trilobite fossils may be found in Cambrian rocks? |
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Definition
| Because the Trilobites became extincted before the Triasstic time. |
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| Why are radioactive materials useful for measuring geological time? |
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Definition
| The disintegration of radioactive material occurs at a predictable rate. |
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Definition
| Places events in sequence 1st 2nd 3rd it does not give an exact date, uses the law of superpostion. |
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Definition
| The bottom layer of strata is the oldest if nothing has been disturbed. |
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Definition
| Matching of similar rock layers in different areas. |
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Definition
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Definition
| Remains of an organism that existed for a relatively breif geologic time were found over a wide area. |
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Definition
| like a keybed, event that happened quickly and was widespread. |
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Definition
| A missing part of geologic record. Weathering and erosion "wipe" away layers of rock and form a gap in timeline. |
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Definition
| Bend in a rock, deep underground and intense pressure. |
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Definition
| Breaking in rock layers (always younger) |
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Definition
| When rocks completly turn over. |
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Definition
| Actual age, isotopes unstable elements, decay product, nothing effects decay rate. |
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Definition
| The time it takes for exactly one half of the unstable isotope to decay into the decay product. |
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Definition
| Substancethat the radioactive material turns into. |
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