The Blackfoot diatreme is a diatreme in southeastern British Columbia, Canada, located 60 km (37 mi) northeast of Cranbrook. It is 1,000 m (3,281 ft) in length with a maximum width of 400 m (1,312 ft). The diatreme is elongate in shape, and outcrops east of Blackfoot Creek.
References
Blackfoot diatreme Wikipedia(Text) CC BY-SA