Geologic Time Scale

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Across
  1. 1. a scientific method for determining the precise, numerical age of an object, fossil, or event in years
  2. 3. a period in Earth's history from approximately 252 to 66 million years ago
  3. 6. a unit of time equal to a thousand million years
  4. 7. the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers
  5. 10. the arrangement of events, facts, or items in the sequence that they occurred in time, from earliest to latest
Down
  1. 2. in an undisturbed sequence of rock layers (strata), the oldest layers at the bottom, and the youngest layers are at the top
  2. 4. a period of time in history or a person's life, typically one marked by notable events or particular characteristics
  3. 5. a method of determining the comparative age of rocks, fossils, or archaeological artifacts by establishing the sequence of events rather than providing a specific numerical age
  4. 8. a length or portion of time
  5. 9. a long and distinct period of history with a particular feature or characteristic