You have done a great job in determining the age of these rocks. Because of various statistical and experimental errors, you may not have gotten the exact numerical ages.
  The age of the granite from the Scottish Highlands is 585 million years plus or minus about 50 million years.
  The gabbro from the Sudbury region of Ontario, Canada--a layered iron and magnesium-rich intrusion, is nearly 2 billion years.-- 1843 million years plus or minus about 150 million years.
  The age of metamorphism of the gneiss from Greenland is about 3.66 billion years ago-- 3660 million years plus or minus about 200 million year
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