The Sudbury Igneous Complex is a 1,844 million year-old impact melt sheet in Greater Sudbury, Northern Ontario, Canada. It is part of the Sudbury Basin impact structure, and is classified as a lopolith.

• Significance Of Back-To-Back Facing Directions Along The South Range Of The Sudbury Igneous Complex, Ontario Archived 2007-08-12 at the Wayback Machine

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