Time scale

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Across
  1. 2. Subdivisions of eras, defined by major changes in life and geology.
  2. 3. time: : The vast span of time before the Paleozoic Era
  3. 5. era:The current era, beginning about 66 million years ago
  4. 6. Era: The era from about 541 to 252 million years ago
  5. 8. Large divisions of geological time.
  6. 9. Preserved remains or traces of ancient organisms found in rocks.
Down
  1. 1. was a prehistoric carnivore know as the saber-toothed tiger.
  2. 2. era:The era from about 252 to 66 million years ago
  3. 3. Relating to the Earth’s structure, history, and processes.
  4. 4. small, agile carnivorous dinosaur from the Cretaceous period.
  5. 5. small, soft-bodied marine from Cambrian period
  6. 7. to improve something by removing impurities or unwanted elements.