• Granitic rocks from Rainy Lake are dated at between 2.75 and 2.72 billion years .
• These tools are usually reckoned to be between 10,000 and 11,000 years old .
• Granitic rocks from Rainy Lake are dated at between 2.75 and 2.72 billion years .
• These tools are usually reckoned to be between 10,000 and 11,000 years old .
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012