geologic time

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Across
  1. 1. istheoldesteraofthephanerozoniceon
  2. 4. arethelongestunitsofgeologictime
  3. 6. isabodyofwaterformedwhenoceanwaterfloodscontients
  4. 8. weremesozoicmarinereptileswithsmallheadlangnecksandflippers
  5. 11. erasaresubdivided
  6. 12. istheseparationofapopulationoforganismsfromtherestofitsspeciesdueto
  7. 14. weredomiantmesozoiclandvertebratesthatwalkedwithlegspositioneddiretlybelowthehips
  8. 15. theextintionofmanyspeciesonearthwithinashortperiodoftime
Down
  1. 2. subdividedintosmallerunitsoftime
  2. 3. periodsaresubdivided
  3. 5. istheyoungesteraofthephanerozoiceon
  4. 7. connectstwocontinentspreviouslyseparated
  5. 9. isanacientlandmasswhichseparatedintopresent-daycontients
  6. 10. isthemiddleeraofthephanerozoiceon
  7. 13. isanoxygen-poorenviromentwhereovertimeplantmaterialchagesintocoal