Geologic Time Scale

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Across
  1. 4. An Eon named after hades and an eon before rocks
  2. 5. Time period in "cooperative"
  3. 6. second period during the Phanerozoic Eon and extended from 251–65 million years ago
  4. 8. current and most recent of the three Phanerozoic geological eras and covers the period from 65.5 million years ago to the present.
  5. 9. During this time the Earth's crust cooled and rocks and continental plates began to form
Down
  1. 1. Largest classified time period extending 2 billion years
  2. 2. Period in the geologic time scale
  3. 3. covers roughly the last 545 million years
  4. 7. In geologic time, a subdivision of an epoch