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| not perfectly horizontal or vertical |
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| is a surface where rock has eroded away producing a break or gap in the rock record |
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| How can we fill gaps in the rock record? |
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| by correlation- Matching rocks and fossils from separate locations |
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| represent species that existed on earth for a short length of time, were abundant and inhabited many locations. |
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| rocks or sediment layers that are used as a marker to correlate rock layers |
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| a model of earth's history from its origin 4.6 billion years ago to the present. |
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| What does the geologic time scale confirm about the Cretaceous period? |
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| It ended during the Mesozoic era. |
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| The oldest of the geologic eon is |
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| What could a scientist do to determine what era the Eocene period belongs to on the geologic time scale? |
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| study information related to the Cenozoic era |
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| In what era do we live in? |
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| the longest unit of geologic time |
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| a subdivision of a geologic eon |
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| subdivision of a geologic period |
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| Which unit of geologic time began 66 million years ago and continues to the present? |
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