During a good half of the Holocene the glaciers were SMALLER than now...What is unusual about the modern retreat is the RATE, though we do not know much about the rate of the former retreat (again because of the lack of continuous records).
Holocene: Definition from Answers.com
The Holocene Epoch is synonymous with the Recent or Postglacial interval of Earth's geologic history and extends from 10,000 years ago to the present day.
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