adjective Geology.
prior to a given glacial epoch, especially the Pleistocene.

1850–55; pre- + glacial Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
preglacial (priːˈɡleɪsɪəl)
formed or occurring before a glacial period, esp before the Pleistocene epoch

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In some instances, buried preglacial streams provide extensive groundwater
Preglacial fluvial sediments ma y underlie the glacial deposits in many of the
  preglacial valleys.
Broad outwash plains are located along the entire northern edge of the
  preglacial lakes.
Often preglacial valleys were filled with glacially derived sediment.
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