The Physical Environment

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erratic

Glacial Erratic
Click image to enlarge

Diabase erratic sitting on shale bedrock

Photo credit: USGS Digital Data Series DDS-2.
Used with permission

An erratic is a boulder transported and deposited by a glacier having a composition different than the bedrock upon which it is sitting.
 

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© 2003 - 2006 Michael Ritter (mritter@uwsp.edu)
Last Revised September 26, 2006