Kendu pipe
The Kendu pipe is a diatreme associated with the Birch Mountains kimberlite field in northern Alberta, Canada. It is thought to have formed about 75 million years ago when this part of Alberta was volcanically active during the Late Cretaceous period. See also
List of volcanoes in Canada
Volcanism of Canada
Volcanism of Western Canada

References

Birch Mountains kimberlite field