The Sudbury dike swarm, also called the Sudbury dikes, is a

Mesoproterozoic The Mesoproterozoic Era is a geologic era that occurred from . The Mesoproterozoic was the first era of Earth's history for which a fairly definitive geological record survives. Continents existed during the preceding era (the Paleoproterozoic), ...

dike swarm A dike swarm (American spelling) or dyke swarm (British spelling) is a large geological structure consisting of a major group of parallel, linear, or radially oriented magmatic dikes intruded within continental crust or central volcanoes ...

in northeastern

Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central C ...

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 tot ...

. With an age of 1,238 million years, it is younger than the Sudbury Basin impact event and predates the impact event that formed

Lake Wanapitei Lake Wanapitei (also known as Lake Wahnapitae) occupies a meteorite crater in Sudbury, Ontario, Canada. It is located near the much larger Sudbury meteorite crater but they are not related. The crater is in diameter and the age is estimated to ...

References

Dike swarms Igneous petrology of Ontario Geology of Greater Sudbury Mesoproterozoic magmatism {{Canada-geology-stub