Archaeological discovery

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Across
  1. 3. bony box enclosing the brain
  2. 4. each of the rigid pars that form the skeleton
  3. 6. to show somethings new
Down
  1. 1. axis articulated and formed by the vertebrae
  2. 2. very old and large quadruped fossil reptile
  3. 5. When you are happy with something