Geological time
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Fossil | show 🗑
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| Index Fossil | show 🗑
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| Permineralized Remains | show 🗑
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| Molds and casts | show 🗑
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| Original remains | show 🗑
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| Trace fossils | show 🗑
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| Relative age | show 🗑
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| Superposition | show 🗑
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| Horizontality | show 🗑
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| show | ossil or geologic event expressed in units of time, such as years. A good example is your birthday. You were born at a specific time on a specific day of the year.
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| show | the time taken for the radioactivity of a specified isotope to fall to half its original value.
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| Isotopes | show 🗑
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| show | disintegration of a nucleus that occurs spontaneously or as a result of electron capture.
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| Geologic time | show 🗑
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| Eon | show 🗑
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| Era | show 🗑
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| Period | show 🗑
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| Epoch | show 🗑
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| show |
1.
the hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.
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| show | any marine arthropod of the extinct class Trilobita, from the Paleozoic Era, having a flattened, oval body varying in length from 1 inch (2.5 cm) or less to 2 feet (61 cm).
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| Precambrian | show 🗑
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| Mesozoic Era | show 🗑
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| Cenozoic Era | show 🗑
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