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Dragon pipe
The Dragon 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.〔(Petrogenetic considerations for the Late Cretaceous northern Alberta kimberlite province )〕〔(Alberta Geological Survey: Kimberlites, Indicator Minerals and Diamonds )〕
==See also==
*Volcanism of Canada
*Volcanism of Western Canada
*List of volcanoes in Canada
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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