The Sudbury Igneous Complex is a 1,844 million year-old impact melt sheet in Greater Sudbury,

Northern Ontario Northern Ontario is a primary geographic and quasi-administrative region of the Canadian province of Ontario, the other primary region being Southern Ontario. Most of the core geographic region is located on part of the Superior Geological Prov ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tota ...

. It is part of the

Sudbury Basin The Sudbury Basin (), also known as Sudbury Structure or the Sudbury Nickel Irruptive, is a major geological structure in Ontario, Canada. It is the third-largest known impact crater or astrobleme on Earth, as well as one of the oldest. The c ...

impact structure, and is classified as a lopolith.

References

Significance Of Back-To-Back Facing Directions Along The South Range Of The Sudbury Igneous Complex, Ontario
Geology of Greater Sudbury Igneous petrology of Ontario Paleoproterozoic magmatism {{NorthernOntario-geo-stub